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Modeling Arctic Ocean heat transport and warming episodes in the 20th century caused by the intruding Atlantic Water 被引量:2
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作者 Wang Jia Jin Meibing +6 位作者 Jun Takahashi Tatsuo Suzuki Igor V Polyakov Kohei Mizobata Moto Ikeda Fancois J. Saucier Markus Meier 《Chinese Journal of Polar Science》 2008年第2期159-167,共9页
This study investigates the Arctic Ocean warming episodes in the 20th century using both a high-resolution coupled global climate model and historical observations. The model, with no flux adjustment, reproduces well ... This study investigates the Arctic Ocean warming episodes in the 20th century using both a high-resolution coupled global climate model and historical observations. The model, with no flux adjustment, reproduces well the Atlantic Water core temperature (AWCT) in the Arctic Ocean and shows that four largest decadalscale warming episodes occurred in the 1930s, 70s, 80s, and 90s, in agreement with the hydrographic observational data. The difference is that there was no pre-warming prior to the 1930s episode, while there were two pre-warming episodes in the 1970s and 80s prior to the 1990s, leading the 1990s into the largest and prolonged warming in the 20th century. Over the last century, the simulated heat transport via Fram Strait and the Barents Sea was estimated to be, on average, 31.32 TW and 14.82 TW, respectively, while the Bering Strait also provides 15.94 TW heat into the west- ern Arctic Ocean. Heat transport into the Arctic Ocean by the Atlantic Water via Fram Strait and the Barents Sea correlates significantly with AWCT ( C = 0.75 ) at 0- lag. The modeled North Atlantic Oscillation (NAO) index has a significant correlation with the heat transport ( C = 0.37 ). The observed AWCT has a significant correlation with both the modeled AWCT ( C =0.49) and the heat transport ( C =0.41 ). However, the modeled NAO index does not significantly correlate with either the observed AWCT ( C = 0.03 ) or modeled AWCT ( C = 0.16 ) at a zero-lag, indicating that the Arctic climate system is far more complex than expected. 展开更多
关键词 Arctic ocean heat transport warming episodes modeling.
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Simulated Spatiotemporal Response of Ocean Heat Transport to Freshwater Enhancement in North Atlantic and Associated Mechanisms
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作者 于雷 郜永祺 《Acta meteorologica Sinica》 SCIE 2011年第3期364-375,共12页
The Atlantic Meridional Overturning Circulation (AMOC) transports a large amount of heat to northern high latitudes, playing an important role in the global climate change. Investigation of the freshwater perturbati... The Atlantic Meridional Overturning Circulation (AMOC) transports a large amount of heat to northern high latitudes, playing an important role in the global climate change. Investigation of the freshwater perturbation in North Atlantic (NA) has become one of the hot topics in the recent years. In this study, the mechanism and pathway of meridional ocean heat transport (OHT) under the enhanced freshwater input to the northern high latitudes in the Atlantic are investigated by an ocean-sea ice-atmosphere coupled model. The results show that the anomalous OHT in the freshwater experiment (FW) is dominated by the meridional circulation kinetic and ocean thermal processes. In the FW, OHT drops down during the period of weakened AMOC while the upper tropical ocean turns warmer due to the retained NA warm currents. Conversely, OHT recovers as the AMOC recovers, and the mechanism can be generalized as: 1) increased ocean heat content in the tropical Southern Ocean during the early integration provides the thermal condition for the recovery of OHT in NA; 2) the OttT from the Southern Ocean enters the NA through the equator along the deep Ekman layer; 3) in NA, the recovery of OHT appears mainly along the isopycnic layers of 24.70- 25.77 below the mixing layer. It is then transported into the mixing layer from the "outcropping points" in northern high latitudes, and finally released to the atmosphere by the ocean-atmosphere heat exchange. 展开更多
关键词 the Atlantic meridional overturning circulation meridional ocean heat transport freshwater experiment
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Estimation of eddy heat transport in the global ocean from Argo data 被引量:11
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作者 ZHANG Zhiwei ZHONG Yisen +2 位作者 TIAN Jiwei YANG Qingxuan ZHAO Wei 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第1期42-47,共6页
The Argo data are used to calculate eddy(turbulence) heat transport(EHT) in the global ocean and analyze its horizontal distribution and vertical structure.We calculate the EHT by averaging all the v ′,T ′ profi... The Argo data are used to calculate eddy(turbulence) heat transport(EHT) in the global ocean and analyze its horizontal distribution and vertical structure.We calculate the EHT by averaging all the v ′,T ′ profiles within each 2 ×2 bin.The velocity and temperature anomalies are obtained by removing their climatological values from the Argo "instantaneous" values respectively.Through the Student's t-test and an error evaluation,we obtained a total of 87% Argo bins with significant depth-integrated EHTs(D-EHTs).The results reveal a positive-and-negative alternating D-EHT pattern along the western boundary currents(WBC) and Antarctic Circumpolar Current(ACC).The zonally-integrated D-EHT(ZI-EHT) of the global ocean reaches 0.12 PW in the northern WBC band and –0.38 PW in the ACC band respectively.The strong ZI-EHT across the ACC in the global ocean is mainly caused by the southern Indian Ocean.The ZI-EHT in the above two bands accounts for a large portion of the total oceanic heat transport,which may play an important role in regulating the climate.The analysis of vertical structures of the EHT along the 35 N and 45 S section reveals that the oscillating EHT pattern can reach deep in the northern WBC regions and the Agulhas Return Current(ARC) region.It also shows that the strong EHT could reach 600 m in the WBC regions and 1 000 m in the ARC region,with the maximum mainly located between 100 and 400 m depth.The results would provide useful information for improving the parameterization scheme in models. 展开更多
关键词 eddy heat transport ARGO mesoscale eddy global ocean
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Contributions of the Bering Strait throughflow to oceanic meridional heat transport under modern and Last Glacial Maximum climate conditions
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作者 ZHANG Cunjie LIN Xiaopei 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2019年第2期398-409,共12页
Paleo reconstructions and model simulations have suggested the Bering Strait plays a pivotal role in climate change. However, the contribution of the Bering Strait throughflow to oceanic meridional heat transport (OMH... Paleo reconstructions and model simulations have suggested the Bering Strait plays a pivotal role in climate change. However, the contribution of the Bering Strait throughflow to oceanic meridional heat transport (OMHT) is about 100 times smaller than the OMHT at low latitudes in the modern climate and it is generally ignored. Based on model simulations under modern and Last Glacial Maximum (LGM,~21 ka;ka=thousand years ago) climate conditions, this study highlights the importance of the Bering Strait throughflow to OMHT. The interbasin OMHT induced by the Bering Strait throughflow is estimated by interbasin-intrabasin decomposition. Similar to barotropic-baroclinic-horizontal decomposition, we assume the nonzero net mass transport induced by interbasin throughflows is uniform across the entire section, and the interbasin term is separated to force zero net mass transport for the intrabasin term. Based on interbasinintrabasin decomposition, the contribution of the Bering Strait throughflow is determined as ~0.02 PW (1 PW=10 15 W) under the modern climate, and zero under the LGM climate because the closed Bering Strait blocked interbasin throughflows. The contribution of the Bering Strait throughflow to OMHT is rather small, consistent with previous studies. However, comparisons of OMHT under modern and LGM climate conditions indicate the mean absolute changes are typically 0.05 and 0.20 PWin the North Atlantic and North Pacific, respectively. Thus, the contribution of the Bering Strait throughflow should not be ignored when comparing OMHT under diff erent climate conditions. 展开更多
关键词 oceanIC MERIDIONAL heat transport (OMHT) BERING STRAIT THROUGHFLOW Last Glacial Maximum (LGM)
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Discrepancies in Simulated Ocean Net Surface Heat Fluxes over the North Atlantic
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作者 Chunlei LIU Yazhu YANG +7 位作者 Xiaoqing LIAO Ning CAO Jimmy LIU Niansen OU Richard P.ALLAN Liang JIN Ni CHEN Rong ZHENG 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2022年第11期1941-1955,共15页
The change in ocean net surface heat flux plays an important role in the climate system.It is closely related to the ocean heat content change and ocean heat transport,particularly over the North Atlantic,where the oc... The change in ocean net surface heat flux plays an important role in the climate system.It is closely related to the ocean heat content change and ocean heat transport,particularly over the North Atlantic,where the ocean loses heat to the atmosphere,affecting the AMOC(Atlantic Meridional Overturning Circulation)variability and hence the global climate.However,the difference between simulated surface heat fluxes is still large due to poorly represented dynamical processes involving multiscale interactions in model simulations.In order to explain the discrepancy of the surface heat flux over the North Atlantic,datasets from nineteen AMIP6 and eight highresSST-present climate model simulations are analyzed and compared with the DEEPC(Diagnosing Earth's Energy Pathways in the Climate system)product.As an indirect check of the ocean surface heat flux,the oceanic heat transport inferred from the combination of the ocean surface heat flux,sea ice,and ocean heat content tendency is compared with the RAPID(Rapid Climate Change-Meridional Overturning Circulation and Heat flux array)observations at 26°N in the Atlantic.The AMIP6 simulations show lower inferred heat transport due to less heat loss to the atmosphere.The heat loss from the AMIP6 ensemble mean north of 26°N in the Atlantic is about10 W m–2 less than DEEPC,and the heat transport is about 0.30 PW(1 PW=1015 W)lower than RAPID and DEEPC.The model horizontal resolution effect on the discrepancy is also investigated.Results show that by increasing the resolution,both surface heat flux north of 26°N and heat transport at 26°N in the Atlantic can be improved. 展开更多
关键词 ocean net surface heat flux ocean heat transport DISCREPANCY simulations observations
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Atmospheric Warming Slowdown during 1998-2013 Associated with Increasing Ocean Heat Content 被引量:4
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作者 Changyu LI Jianping HUANG +2 位作者 Yongli HE Dongdong LI Lei DING 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2019年第11期1188-1202,I0006,I0007,I0008,I0009,I0010,I0011,共21页
Although atmospheric greenhouse gas concentrations continuously increased, there was relatively little change in global-averaged surface temperatures from 1998 to 2013, which is known as atmospheric warming slowdown. ... Although atmospheric greenhouse gas concentrations continuously increased, there was relatively little change in global-averaged surface temperatures from 1998 to 2013, which is known as atmospheric warming slowdown. For further understanding the mechanism involved, we explored the energy redistribution between the atmosphere and ocean in different latitudes and depths by using data analysis as well as simulations of a coupled atmosphere–ocean box model. The results revealed that, compared with observational changes of ocean heat content (OHC) associated with rapid warming, the OHC changes related to warming slowdown are relatively larger in multiple ocean basins, particularly in the deeper layer of the Atlantic. The coupled box model also showed that there is a larger increasing trend of OHC under the warming slowdown scenario than the rapid warming scenario. Particularly, during the warming slowdown period, the heat storage in the deeper ocean increases faster than the ocean heat uptake in the surface ocean. The simulations indicated that the warming patterns under the two scenarios are accompanied by distinct outgoing longwave radiation and atmospheric meridional heat transport, as well as other related processes, thus leading to different characteristics of ocean heat uptake. Due to the global energy balance, we suggest this slowdown has a tight relationship with the accelerated heat transport into the global ocean. 展开更多
关键词 WARMING SLOWDOWN ocean heat content BOX model heat transport
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The annual mean sketches and climatological variability of the volume and heat transports through the inter-basin passages:A study based on 1 400-year spin up of MOM4p1
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作者 ZHU Yaohua WEI Zexun +2 位作者 WANG Yonggang GUAN Yuping WANG Xinyi 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第9期12-24,共13页
The annual mean volume and heat transport sketches through the inter-basin passages and transoceanic sections have been constructed based on 1400-year spin up results of the MOM4p 1. The spin up starts from a state of... The annual mean volume and heat transport sketches through the inter-basin passages and transoceanic sections have been constructed based on 1400-year spin up results of the MOM4p 1. The spin up starts from a state of rest, driven by the monthly climatological mean force from the NOAAWorld Ocean Atlas (1994). The volume transport sketch reveals the northward transport throughout the Pacific and southward transport at all latitudes in the Atlantic. The annual mean strength of the Pacific-Arctic-Atlantic through flow is 0.63x106 m3/s in the Bering Strait. The majority of the northward volume transport in the southern Pacific turns into the Indonesian through flow (ITF) and joins the Indian Ocean equatorial current, which subse- quently flows out southward from the Mozambique Channel, with its majority superimposed on the Ant- arctic Circumpolar Current (ACC). This anti-cyclonic circulation around Australia has a strength of 11 x 106 ms /s according to the model-produced result. The atmospheric fresh water transport, known as P-E^R (pre- cipitation minus evaporation plus runoff), constructs a complement to the horizontal volume transport of the ocean. The annual mean heat transport sketch exhibits a northward heat transport in the Atlantic and poleward heat transport in the global ocean. The surface heat flux acts as a complement to the horizontal heat transport of the ocean. The climatological volume transports describe the most important features through the inter-basin passages and in the associated basins, including: the positive P-E+R in the Arctic substantially strengthening the East Greenland Current in summer; semiannual variability of the volume transport in the Drake Passage and the southern Atlantic-Indian Ocean passage; and annual transport vari- ability of the ITF intensifying in the boreal summer. The climatological heat transports show heat storage in July and heat deficit in January in the Arctic; heat storage in January and heat deficit in July in the Antarctic circumpolar current regime (ACCR); and intensified heat transport of the iTF in July. The volume transport of the ITF is synchronous with the volume transport through the southern Indo-Pacific sections, but the year-long southward heat transport of the ITF is out of phase with the heat transport through the equatorial Pacific, which is northward before May and southward after May. This clarifies the majority of the ITF origi- natinR from the southern Pacific Ocean. 展开更多
关键词 volume transport heat transport global ocean circulation inter-basin passages climatologicalvariability
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Simulations and Projections of Winter Sea Ice in the Barents Sea by CMIP6 Climate Models
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作者 Rongrong PAN Qi SHU +3 位作者 Zhenya SONG Shizhu WANG Yan HE Fangli QIAO 《Advances in Atmospheric Sciences》 SCIE CAS CSCD 2023年第12期2318-2330,共13页
Dramatic changes in the sea ice characteristics in the Barents Sea have potential consequences for the weather and climate systems of mid-latitude continents,Arctic ecosystems,and fisheries,as well as Arctic maritime ... Dramatic changes in the sea ice characteristics in the Barents Sea have potential consequences for the weather and climate systems of mid-latitude continents,Arctic ecosystems,and fisheries,as well as Arctic maritime navigation.Simulations and projections of winter sea ice in the Barents Sea based on the latest 41 climate models from the Coupled Model Intercomparison Project Phase 6(CMIP6)are investigated in this study.Results show that most CMIP6 models overestimate winter sea ice in the Barents Sea and underestimate its decreasing trend.The discrepancy is mainly attributed to the simulation bias towards an overly weak ocean heat transport through the Barents Sea Opening and the underestimation of its increasing trend.The methods of observation-based model selection and emergent constraint were used to project future winter sea ice changes in the Barents Sea.Projections indicate that sea ice in the Barents Sea will continue to decline in a warming climate and that a winter ice-free Barents Sea will occur for the first time during 2042-2089 under the Shared Socioeconomic Pathway 585(SSP5-8.5).Even in the observation-based selected models,the sensitivity of winter sea ice in the Barents Sea to global warming is weaker than observed,indicating that a winter ice-free Barents Sea might occur earlier than projected by the CMIP6 simulations. 展开更多
关键词 Arctic sea ice Barents Sea ocean heat transport sea ice projection CMIP6
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全球变暖停滞期间海洋次表层增温机制研究 被引量:1
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作者 许卓弈 刘浩 +1 位作者 林霄沛 吴德星 《中国海洋大学学报(自然科学版)》 CAS CSCD 北大核心 2023年第1期1-8,共8页
全球变暖停滞期间,海洋表层升温速度减缓,同时次表层出现增温现象。针对变暖停滞期的海洋热含量垂向再分配机制,本研究基于海洋再分析产品ECCO4以及Ishii次表层温度数据集、NCEP2、卫星高度计数据等观测资料,采用新的诊断方法评估绝热... 全球变暖停滞期间,海洋表层升温速度减缓,同时次表层出现增温现象。针对变暖停滞期的海洋热含量垂向再分配机制,本研究基于海洋再分析产品ECCO4以及Ishii次表层温度数据集、NCEP2、卫星高度计数据等观测资料,采用新的诊断方法评估绝热和非绝热过程对海洋热含量变化率垂向结构与水平空间分布的影响。结果显示,2002—2011年期间,沿等密面、跨等密面非绝热垂向热通量的变化主要发生在热带外海域,且呈现正负相抵的状态。相反,风驱动的绝热调整对垂向净热通量的改变起主导作用。因此,在全球变暖停滞期间,海洋热含量的垂向再分配主要归因于风驱动而非扩散过程。1993—2011年北大西洋副极地海盆区风应力旋度变化率主要为负值,一方面不利于正风应力旋度引起的向上热输送,另一方面加强了负风应力旋度导致的向下热输运,这一现象解释了该海域次表层内海洋热含量的增加和温度的升高。 展开更多
关键词 全球变暖停滞 海洋热含量 垂向热输运 风应力旋度
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巴伦支海近40年来海洋热含量变化特征及影响机制
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作者 赖颖 王雪竹 +2 位作者 葛志成 陈姣 陈美香 《极地研究》 CAS CSCD 北大核心 2023年第2期183-196,共14页
利用ORAS5海洋-海冰再分析数据集,研究发现1979—2018年间巴伦支海海洋热含量存在显著的季节和年际变化特征,且有持续上升趋势。海-气热通量是控制巴伦支海海洋热含量季节变化的主要因素,而北大西洋流的海洋热输运则影响其年际变化和上... 利用ORAS5海洋-海冰再分析数据集,研究发现1979—2018年间巴伦支海海洋热含量存在显著的季节和年际变化特征,且有持续上升趋势。海-气热通量是控制巴伦支海海洋热含量季节变化的主要因素,而北大西洋流的海洋热输运则影响其年际变化和上升趋势。北大西洋流的温度和流速变化对其海洋热输运的年际变化均有贡献,而其海洋热输运的上升趋势则主要是来自于北大西洋流温度的增加。此外,巴伦支海开阔海域和冰区的海-气热交换呈现相反的趋势,在无海冰覆盖的开阔海域,海洋放热减少,海洋混合减弱;而在有海冰覆盖的海域,海洋放热则显著增加,海洋混合增强。 展开更多
关键词 巴伦支海 海洋热含量 海洋热输运 海-气热通量
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基于再分析数据的全球海洋水体和热盐输运及其季节变化
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作者 崔伟 杨俊钢 +1 位作者 张杰 周超杰 《海洋科学进展》 CAS CSCD 北大核心 2023年第2期190-206,共17页
全球海洋环流复杂,其产生的水体和热盐输运决定了各大洋物质和能量的再分配,并且对海气相互作用以及全球气候变化产生重要影响。本研究基于GLORYS12、GLORYS2V4、C-GLORS05、FOAM和ORAS5五种再分析资料对全球12个关键截面处的海洋水体... 全球海洋环流复杂,其产生的水体和热盐输运决定了各大洋物质和能量的再分配,并且对海气相互作用以及全球气候变化产生重要影响。本研究基于GLORYS12、GLORYS2V4、C-GLORS05、FOAM和ORAS5五种再分析资料对全球12个关键截面处的海洋水体和热盐输运进行了估算。平均计算结果显示,纬向积分的海洋经向盐量输运与经向体积输运的变化基本一致,这主要是由于海水盐度垂向变化较小,水体盐量输运与体积输运大小成比例。全球海洋在35°S附近呈现经向体积输运极值,其南向输运量接近10 Sv。由于海洋温度随深度增加迅速减小,且中下层较为稳定,因此海洋经向热量输运与上层海洋环流相关性更高。全球海洋在南北半球均呈现向极的经向热量输运,北半球中低纬度输运量在1.5~2.0PW,南半球中低纬度输运量在1.0 PW左右。N向热量输运横跨整个大西洋,南大西洋中低纬度输运量在0.3~1.0 PW,北大西洋中低纬度输运量在1.0~1.3 PW。与大洋经向输运相比,南大洋由于强劲的南极绕极流的E向流动,其纬向水体和热盐输运显著。计算结果显示,通过南大洋20°E、146°E截面以及德雷克海峡分别约有144.50、162.46和146.05 Sv的体积输运(对应5.10×10^(9)、5.74×10^(9)和5.15×10^(9)kg/s的盐量输运,以及1.27、2.28和1.58 PW的热量输运)。另外,海洋水体和热盐输运气候态月变化显示,各大洋水体和热盐经向输运均呈现较明显的季节变化,相较于体积和盐量输运,南大洋纬向热量输运季节变化最为显著。 展开更多
关键词 全球海洋 水体输运 热盐输运 再分析数据 季节变化
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冬季北太平洋西部上层海洋的热量输送 被引量:4
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作者 赵永平 陈永利 +1 位作者 杨连素 林滋新 《海洋与湖沼》 CAS CSCD 北大核心 1994年第1期9-14,共6页
用海气界面净热量收支和1950-1979年表层水温资料,计算了冬季北太平洋西部上层海洋热通量散度场,指出冬季北太平洋西部黑潮将大量低纬暖水输送到中高纬度海域,在30-35°N最大;亲潮将极地冷水沿千岛群岛向南输送,在45-50... 用海气界面净热量收支和1950-1979年表层水温资料,计算了冬季北太平洋西部上层海洋热通量散度场,指出冬季北太平洋西部黑潮将大量低纬暖水输送到中高纬度海域,在30-35°N最大;亲潮将极地冷水沿千岛群岛向南输送,在45-50°N最大;两者在40°N附近相遇,混合减弱后沿纬向东传。同时用EOF分析方法对热通量散度距平场分型,前3个主要型分别为:黑潮亲潮偶合型、北太平洋海流型和冷平流优势型。最后还揭示了第一主要型与北太平洋副热带高压之间有意义的相关关系。 展开更多
关键词 海洋 热量输送 年际变化 太平洋
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一个海洋环流模式模拟的北印度洋经向环流及其热输送 被引量:4
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作者 吴方华 李薇 +1 位作者 刘海龙 张学洪 《大气科学》 CSCD 北大核心 2008年第1期14-26,共13页
对比两个同化资料GODAS(Global Ocean Data Assimilation System)和SODA(Simple Ocean Data Assimila-tion),考察中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室发展的气候系统海洋模式LICOM(LASG/IAP Climate ... 对比两个同化资料GODAS(Global Ocean Data Assimilation System)和SODA(Simple Ocean Data Assimila-tion),考察中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室发展的气候系统海洋模式LICOM(LASG/IAP Climate system Ocean Model)模拟的北印度洋经向环流及热输送的气候态。LICOM能抓住北印度洋大尺度环流的季节变化特征,模拟的年平均越赤道热输送为-0.24 PW(1 PW=1015W),较之以往的数值模式结果更接近观测和同化资料。与同化资料的差异主要体现在季节变化强度,北半球夏季在赤道以南偏弱0.5 PW,这与模式夏季的纬向风应力偏弱,热输送中的大项Ekman热输送模拟偏弱,从而模拟的经圈翻转环流较浅有关。 展开更多
关键词 LASG/IAP气候系统海洋模式 北印度洋 经向热输送 翻转环流 纬向风
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北极海冰消退及其主要驱动机制 被引量:6
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作者 刘忠方 《自然杂志》 CAS 2022年第1期39-46,共8页
极地海冰在全球气候变化中扮演着重要角色。在全球变暖背景下,北极海冰正在以过去千年来所未有的速率消退,预计到21世纪中叶或更早,北极海域将面临夏季无冰的状况。北极海冰减少不仅改变北极地区的生态和环境,还通过大尺度的海气环流影... 极地海冰在全球气候变化中扮演着重要角色。在全球变暖背景下,北极海冰正在以过去千年来所未有的速率消退,预计到21世纪中叶或更早,北极海域将面临夏季无冰的状况。北极海冰减少不仅改变北极地区的生态和环境,还通过大尺度的海气环流影响中纬度地区,甚至是全球的天气和气候。文章简要介绍了北极海冰消退的特征和主要驱动机制,并对未来北极海冰消退机理研究进行了展望。 展开更多
关键词 北极海冰 全球变暖 大气环流 海洋热输送 辐射反馈
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ENSO事件次表层海温的两个模态及其对大气环流的影响 被引量:1
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作者 陈永利 唐晓晖 +1 位作者 王凡 赵永平 《海洋与湖沼》 CAS CSCD 北大核心 2020年第4期851-860,共10页
利用SODA海洋同化资料和NCEP再分析大气资料,分析了热带太平洋次表层海温异常(subsurfaceoceantemperatureanomaly,SOTA)与厄尔尼诺与南方涛动(ElNi?o-SouthernOscillation,ENSO)循环的联系,及SOTA对大气环流的影响。回顾传统ENSO研究,... 利用SODA海洋同化资料和NCEP再分析大气资料,分析了热带太平洋次表层海温异常(subsurfaceoceantemperatureanomaly,SOTA)与厄尔尼诺与南方涛动(ElNi?o-SouthernOscillation,ENSO)循环的联系,及SOTA对大气环流的影响。回顾传统ENSO研究,指出存在的问题,提出了ENSO影响大气研究的新思路,得到以下结果:(1)以SOTA为基本资料的研究发现, ENSO事件有两个模态,主要出现在冬季的第一模态对冬季及夏季亚洲-北太平洋-北美地区上空中高纬大气环流有重要影响,主要出现在夏季的第二模态对该地区上空夏季热带和副热带大气系统有重要作用。(2)ENSO事件通过与ENSO相联系的热带太平洋海面温度异常(ENSO-relatedseasurface temperatureanomaly,RSSTA)对大气的异常热通量输送,强迫Walker环流和Hadley环流变化,导致热带和北太平洋及周边地区上空大气环流异常,进而影响相关地区冬季和夏季的气候。(3)海表面温度异常(seasurfacetemperatureanomaly,SSTA)包含RSSTA和大气异常导致的海温变化(sea temperature anomaly caused by atmospheric anomaly, STA)两部分, RSSTA是ENSO事件过程中海洋内部热动力结构调整导致的海面温度变化,在海洋对大气的热输送过程中,它随ENSO事件演变不断更新;STA是大气受RSSTA海洋异常加热后导致的大气环流异常对海面温度的影响,在海洋浅表层STA对RSSTA有重大影响。本文最后讨论了ENSO事件期间热带海洋对大气热输送过程,指出ENSO事件通过海洋内部热动力结构调整产生RSSTA,它直接对大气异常加热,导致大气环流和气候异常,局地海气之间负反馈过程产生STA,反过来抑制RSSTA。结果还指出,人们常用的SSTA变率实际上主要由秋冬季节RSSTA主导,丢失了春夏季ENSO信息,用SSTA研究ENSO事件存在局限性,这也可能是ENSO事件春季预报障碍的原因之一。 展开更多
关键词 ENSO事件两个模态 海表面温度异常(sea surface temperature anomaly SSTA) 次表层海温异常(subsurface ocean temperature anomaly SOTA) 大气环流异常 海气热通量边界过程
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关于太阳系外行星的宜居性 被引量:3
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作者 胡永云 《气象科技进展》 2016年第3期110-114,共5页
愈来愈多的太阳系外行星的发现激发了人们对发现太阳系外生命的热情期待。在诸多决定生命存在的因素中,液态水的存在是一个关键性的因素。因此,确定一颗太阳系外行星是否宜居,其首要条件是该行星的表面温度是否能够保证液态水的长期存... 愈来愈多的太阳系外行星的发现激发了人们对发现太阳系外生命的热情期待。在诸多决定生命存在的因素中,液态水的存在是一个关键性的因素。因此,确定一颗太阳系外行星是否宜居,其首要条件是该行星的表面温度是否能够保证液态水的长期存在。简要介绍位于红矮星宜居带内的行星的宜居性研究进展。由于潮汐锁相作用,该类行星的一面永远面对恒星,较为温暖;而另一面永远背对恒星,极端寒冷。极低的温度有可能导致大气成分和水分完全冻结在背阳面,并导致行星不适宜生命存在。在此,讨论大气和海洋环流能否输送足够多的热量到背阳面,并加热背阳面,从而避免大气和水分的完全冻结。最后,根据地球大气和海洋环流以及热量输送的知识对这些问题加以阐述。 展开更多
关键词 太阳系外行星 宜居性 大气海洋热量输送 行星气候
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海洋声层析应用与观测研究综述 被引量:11
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作者 廖光洪 朱小华 +2 位作者 林巨 郑红 梁楚进 《地球物理学进展》 CSCD 北大核心 2008年第6期1782-1790,共9页
综述了自20世纪80年代以来国际上开展的主要海洋声层析观测实验.对它在海洋观测里的应用和取得的成果进行了系统总结和回顾,主要包括:(1)海洋中尺度现象观测;(2)海流,潮流,涡度的测量;(3)对流监测;(4)流量和热量输运测量;(5)气候声学测... 综述了自20世纪80年代以来国际上开展的主要海洋声层析观测实验.对它在海洋观测里的应用和取得的成果进行了系统总结和回顾,主要包括:(1)海洋中尺度现象观测;(2)海流,潮流,涡度的测量;(3)对流监测;(4)流量和热量输运测量;(5)气候声学测温;(6)内波观测;(7)沿海声学层析;(8)中国学者的工作.对海洋声层析的相关问题作了评述,指出了海洋声学层析研究的重大意义、广阔的应用前景和存在的难点,对我国在这一领域的研究进行了展望并提出一些建议. 展开更多
关键词 海洋声层析 海洋中尺度现象 海流 潮流与涡度 对流 流量与热容量 气候声学测温 内波 集成水下声学 观测系统
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北太平洋经向热输送的季节变化 被引量:5
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作者 厉萍 张启龙 +1 位作者 刘洪伟 许建平 《海洋科学进展》 CAS CSCD 北大核心 2011年第3期275-284,共10页
利用1958—2007年间的月平均SODA资料,较系统地研究了北太平洋经向热输送的基本特征和季节变化,并探讨了热输送季节变化的可能原因。结果表明,北太平洋经向净热输送的季节变化具有明显的区域性特征,在14°N以南海域热输送的季节变... 利用1958—2007年间的月平均SODA资料,较系统地研究了北太平洋经向热输送的基本特征和季节变化,并探讨了热输送季节变化的可能原因。结果表明,北太平洋经向净热输送的季节变化具有明显的区域性特征,在14°N以南海域热输送的季节变化较显著,而在14°N以北海域则较小;北太平洋经向净热输送的季节变化在很大程度上是由同一纬度上Ekman热输送和中东太平洋经向热输送的季节变化引起的。 展开更多
关键词 北太平洋 黑潮 棉兰老流 热输送 季节变化
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基于不同海洋再分析资料的吕宋海峡热能输送及其变化 被引量:1
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作者 曹宁 李润朝 +2 位作者 叶颖昕 郑兆轩 刘春雷 《广东海洋大学学报》 CAS 北大核心 2022年第5期72-81,共10页
【目的】揭示吕宋海峡热能输运的季节和年际变化特征,并评估不同海洋再分析资料计算结果的异同。【方法】基于CMEMS的1993-2019年四套海洋再分析资料,通过对比分析,研究吕宋海峡120.75oE剖面热能输运的季节和年际变化特征。【结果】通... 【目的】揭示吕宋海峡热能输运的季节和年际变化特征,并评估不同海洋再分析资料计算结果的异同。【方法】基于CMEMS的1993-2019年四套海洋再分析资料,通过对比分析,研究吕宋海峡120.75oE剖面热能输运的季节和年际变化特征。【结果】通过吕宋海峡的热能输送主要发生在500 m以浅,呈“流套型”或者“弯曲型”结构。净的热能输送以输入南海为主,夏季微弱净流出,其他季节是净流入,冬季最强。吕宋海峡净热输运年际变化存在约6 a周期,与ENSO显著正相关(P<0.05),在ENSO发展期的10月份和衰退期的4月份相关系数最高。【结论】吕宋海峡净热输运及相关流场和混合层的季节变化受南海季风和海洋环境季节变化影响显著,在年际尺度主要体现为与ENSO相关的变化特征。四套资料在描述吕宋海峡热能输运的季节和年际变化方面有较好的一致性,但是在输运强度和流场结构变化方面存在显著差异,其中FOAM资料的差异性较为明显。 展开更多
关键词 吕宋海峡 热能输运 海洋再分析
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太平洋中的主要起伏模态(英文)
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作者 彭启华 黄瑞新 +1 位作者 王卫强 王东晓 《热带海洋学报》 CAS CSCD 北大核心 2020年第2期1-10,共10页
对海洋中起伏运动(heaving)信号的时空分布研究能够帮助我们更好地了解气候系统中的年际和年代际变率。文章通过再分析资料和模式对太平洋区域的heaving主要模态进行了研究。研究结果表明:太平洋区域主要存在两种heaving模态:第一模态... 对海洋中起伏运动(heaving)信号的时空分布研究能够帮助我们更好地了解气候系统中的年际和年代际变率。文章通过再分析资料和模式对太平洋区域的heaving主要模态进行了研究。研究结果表明:太平洋区域主要存在两种heaving模态:第一模态主要表现为赤道东西两侧的温跃层异常信号反位相;第二模态表现为赤道区域和副热带区域的温跃层异常信号呈现反位相变化的规律。本文对这两个主要heaving模态所涉及的物理过程进行详细讨论,结果表明:东西反位相模态主要是受赤道波动调节的结果;而经向结构模态则主要是由赤道地区的波动和副热带区域的风应力旋度异常作用共同导致。此外,我们还讨论了heaving模态可以通过海洋波动以及Ekman输送等过程对海盆尺度的热输送(振幅约为5x1014W)以及海洋热含量(振幅约为1.5x1020J)的再分配起到了关键的调制作甩进一步表明heaving模态对全球气候变化有着重要的作用。 展开更多
关键词 起伏运动模态 太平洋 海洋波动 热输送 气候变化
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