East Asian summer monsoon(EASM)precipitation affects the lives of billions of people and impacts the stability of fragile desert ecosystems in central Asia[1].Therefore,many studies have focused on understanding the v...East Asian summer monsoon(EASM)precipitation affects the lives of billions of people and impacts the stability of fragile desert ecosystems in central Asia[1].Therefore,many studies have focused on understanding the variability of the EASM and its relationship with insolation,ice sheet,and C0_(2)forcings[1-3].Evidence for EASM variability is preserved in the eolian dust sequences on the Chinese Loess Plateau(CLP),which highlight the importance of Northern Hemisphere(NH)ice sheets,C0_(2)levels,and insolation in controlling the strength of the EASM during the Quaternary[2].In contrast,Pliocene(5.3-2.6 Ma)proxy records of the EASM from the CLP reveal weak orbital signals,suggesting weak sensitivity to ice sheets,C0_(2)levels,and insolation forcing during this sustained warm period[4].These Pliocene proxy records also contrast model simulations which suggest high sensitivity of the EASM to orbital forcing(particularly precession)during this time[5].展开更多
Construction of the polyaryl quaternary unit through a ZnBr2 catalyzed tandem coupling/semipinacol rearrangement participated by allylic cations was reported for the first time.
基金supported by the Second Tibetan Plateau Scientific Expedition(2019QZKK0704)the National Natural Science Foundation of China(42030505 and 41672157)+1 种基金the State Scholarship Fund organized by the China Scholarship Council(CSC)in 2018,the Royal Society(IE 141128)the U.S.National Science Foundation(1348005,1348075,and 1545859)。
文摘East Asian summer monsoon(EASM)precipitation affects the lives of billions of people and impacts the stability of fragile desert ecosystems in central Asia[1].Therefore,many studies have focused on understanding the variability of the EASM and its relationship with insolation,ice sheet,and C0_(2)forcings[1-3].Evidence for EASM variability is preserved in the eolian dust sequences on the Chinese Loess Plateau(CLP),which highlight the importance of Northern Hemisphere(NH)ice sheets,C0_(2)levels,and insolation in controlling the strength of the EASM during the Quaternary[2].In contrast,Pliocene(5.3-2.6 Ma)proxy records of the EASM from the CLP reveal weak orbital signals,suggesting weak sensitivity to ice sheets,C0_(2)levels,and insolation forcing during this sustained warm period[4].These Pliocene proxy records also contrast model simulations which suggest high sensitivity of the EASM to orbital forcing(particularly precession)during this time[5].
基金supported by the National Natural Science Foundation of China (Grant Nos. 20621091,20672048,and 20732002)the "111" program of Chinese Education Ministry
文摘Construction of the polyaryl quaternary unit through a ZnBr2 catalyzed tandem coupling/semipinacol rearrangement participated by allylic cations was reported for the first time.
