Hydrothermal plume is an important constituent of seabed hydrothermal circulation and is also one of the characteristics of active hydrothermal vents. Portable Miniature Autonomous Plume Recorders （MAPR） attached to...Hydrothermal plume is an important constituent of seabed hydrothermal circulation and is also one of the characteristics of active hydrothermal vents. Portable Miniature Autonomous Plume Recorders （MAPR） attached to a towed deep-sea instrument was used to search for hydrothermal plumes and hydrothermal vents. We introduced the basic principle of MAPR based on deep towing technology to detect plumes, then analyzed the factors affecting the quality of the MAPR data and presented a data correction method for MAPR, including instrument location correction, noise reduction processing, system error elimination and seawater background reduction. Finally we applied the method to analyze MAPR data obtained during the Chinese DY115-21 cruise on R/VDayang Iin the “Precious Stone Mountain” hydrothermal field on the Gala-pagos Microplate. The results provided a better understanding of the distribution of the hydrothermal activ-ity in this field, indicating the presence of a new hydrothermal vent.展开更多
In recent years, a series of cruises have been launched by China Ocean Mineral Resources Research and Development Association （COMRA） to conduct hydrothermal activity investigation at mid-ocean ridges （MOR）. Since...In recent years, a series of cruises have been launched by China Ocean Mineral Resources Research and Development Association （COMRA） to conduct hydrothermal activity investigation at mid-ocean ridges （MOR）. Since the first active hydrothermal field at 49.6°E Southwest Indian Ridge （SWIR） was found in 2007 by Chinese scientists on board R/V Dayangyihao, more hydrothermal fields have been found on the SWIR and equatorial East Pacific Rise （EPR） [1-4].展开更多
Water column turbidity and temperature were investigated along the Central Indian Ridge (CIR) from 25°19′S to 23°48′S during a December 2005 cruise on board Chinese R/V DayangYihao. Measurements were made ...Water column turbidity and temperature were investigated along the Central Indian Ridge (CIR) from 25°19′S to 23°48′S during a December 2005 cruise on board Chinese R/V DayangYihao. Measurements were made using NOAA’s MAPR (Miniature Autonomous Plume Recorder) sensors during CTD casts, TV grabber operations, and tow-yo profiles, yielding the following results on hydrothermal plume anomalies: (1) Strong hydrothermal turbidity and temperature anomalies were recorded over the pre- viously discovered Kairei (25°19.2′S, 70°02.4′E) and Edmond (23°52.7′S, 69°35.8′E) vent fields, with the plume anomalies concentrated at depths of 2150―2300 m and 2700―2900 m, respectively. The maxi- mum height of the turbidity anomalies near the Kairei vent field recorded in December 2005 was slightly below 2100 m, which is consistent with the plume depth measured in June 2001, indicating that the Kairei plume may have maintained its buoyancy flux in the intervening 4.5 years. (2) The water column beneath the Kairei plume has background anomalies of about 0.005△NTU, whereas no such back- ground turbidity anomalies were observed below the Edmond hydrothermal plume. (3) No visible tur- bidity anomalies were detected from 24°42′S to 24°12′S including the Knorr Seamount. Thus 24°12′S marks the southern end of the hydrothermal plume. (4) Significant turbidity anomalies were observed at four individual sections from 24°12′S to 23°56′S at the depth of 2500―3000 m along the eastern rift valley wall. Whether the individual sections of anomalies are connected is still unknown due to the absence of data at the intervening gaps. If the four sections are connected with each other and are linked to the Edmond vent field farther to the north, the total along-axis length of the plume anomaly would be more than 37 km, implying a plume incidence value ph of 0.38, greater than the predicted ph of 0.21―0.25 based on the spreading rate of the Central Indian Ridge.展开更多
基金The National Basic Research Program of China(973 Program)under contract No.2012CB417305China Ocean Mineral Resources R&D Association"Twelfth Five-Year"Major Program under contract Nos DY125-11-R-01 and DY125-11-R-05+1 种基金the Natural Science Foundation of Zhejiang Province under contract No.LY12D06006the scientific research fund of the Second Institute of Oceanography under contract No.JG1203
文摘Hydrothermal plume is an important constituent of seabed hydrothermal circulation and is also one of the characteristics of active hydrothermal vents. Portable Miniature Autonomous Plume Recorders （MAPR） attached to a towed deep-sea instrument was used to search for hydrothermal plumes and hydrothermal vents. We introduced the basic principle of MAPR based on deep towing technology to detect plumes, then analyzed the factors affecting the quality of the MAPR data and presented a data correction method for MAPR, including instrument location correction, noise reduction processing, system error elimination and seawater background reduction. Finally we applied the method to analyze MAPR data obtained during the Chinese DY115-21 cruise on R/VDayang Iin the “Precious Stone Mountain” hydrothermal field on the Gala-pagos Microplate. The results provided a better understanding of the distribution of the hydrothermal activ-ity in this field, indicating the presence of a new hydrothermal vent.
基金supported by China Ocean Mineral Resources Research and Development Association Program (Grant No. DY115-02-1-01)State Oceanic Administration Youth Science Fund (Grant No. 2010318)
文摘In recent years, a series of cruises have been launched by China Ocean Mineral Resources Research and Development Association （COMRA） to conduct hydrothermal activity investigation at mid-ocean ridges （MOR）. Since the first active hydrothermal field at 49.6°E Southwest Indian Ridge （SWIR） was found in 2007 by Chinese scientists on board R/V Dayangyihao, more hydrothermal fields have been found on the SWIR and equatorial East Pacific Rise （EPR） [1-4].
基金WHOI Deep Ocean Exploration Institute and Cecil H. and Ida M. Green Technology Innovation Awards (J. Lin) and the Chinese Ocean Mineral Re-sources R&D Association (J. Chen)
文摘Water column turbidity and temperature were investigated along the Central Indian Ridge (CIR) from 25°19′S to 23°48′S during a December 2005 cruise on board Chinese R/V DayangYihao. Measurements were made using NOAA’s MAPR (Miniature Autonomous Plume Recorder) sensors during CTD casts, TV grabber operations, and tow-yo profiles, yielding the following results on hydrothermal plume anomalies: (1) Strong hydrothermal turbidity and temperature anomalies were recorded over the pre- viously discovered Kairei (25°19.2′S, 70°02.4′E) and Edmond (23°52.7′S, 69°35.8′E) vent fields, with the plume anomalies concentrated at depths of 2150―2300 m and 2700―2900 m, respectively. The maxi- mum height of the turbidity anomalies near the Kairei vent field recorded in December 2005 was slightly below 2100 m, which is consistent with the plume depth measured in June 2001, indicating that the Kairei plume may have maintained its buoyancy flux in the intervening 4.5 years. (2) The water column beneath the Kairei plume has background anomalies of about 0.005△NTU, whereas no such back- ground turbidity anomalies were observed below the Edmond hydrothermal plume. (3) No visible tur- bidity anomalies were detected from 24°42′S to 24°12′S including the Knorr Seamount. Thus 24°12′S marks the southern end of the hydrothermal plume. (4) Significant turbidity anomalies were observed at four individual sections from 24°12′S to 23°56′S at the depth of 2500―3000 m along the eastern rift valley wall. Whether the individual sections of anomalies are connected is still unknown due to the absence of data at the intervening gaps. If the four sections are connected with each other and are linked to the Edmond vent field farther to the north, the total along-axis length of the plume anomaly would be more than 37 km, implying a plume incidence value ph of 0.38, greater than the predicted ph of 0.21―0.25 based on the spreading rate of the Central Indian Ridge.
