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Seasonal and regional diff erences in long-term changes in large mesozooplankton(>505μm)biomass and abundance in a semi-enclosed subtropical bay

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Journal of Oceanology and Limnology 2021年第6期39卷 2281-2294页

作者： Ping DU Zhibing JIANG Yuanli ZHU Yibo LIAO Quanzhen CHEN Jiangning ZENG Lu SHOU Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural Resources(MNR)Hangzhou 310012China Laboratory for Marine Fisheries Science and Food Production Processes Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Ocean Space Resource Management Technology MNRHangzhou 310012China

Obvious spatiotemporal heterogeneity is a distinct characteristic of ecosystems in subtropical *** aid targeted management and ecological restoration in long and narrow semi-enclosed subtropical bays,we analyzed seasonal and regional differences in long-term changes(1980-2019)in the biomass and abundance of large mesozooplankton(LMZ;>505μm)in Xiangshan Bay,Zhejiang,*** found spatiotemporal heterogeneity in the historical changes of *** negative trends in LMZ biomass were found in the inner and middle bay during the warm season(summer and autumn),when the nutrient concentration(especially dissolved inorganic nitrogen)and temperature increased *** changes in Xiangshan Bay began in the late 1980s or early 1990s,coinciding with large-scale fish cage development.A rapid decline in LMZ biomass occurred after 2005 when power plants commenced operation,accelerating the warming ***,the joint stress of eutrophication and warming likely precipitated the decline in LMZ ***,a significant increase in LMZ biomass was found in the outer bay in *** trend was consistent with the trend of LMZ biomass near the Changjiang(Yangtze)River estuary,which indicates that the pelagic ecosystem in the outer bay was aff ected by water from the Changjiang River estuary during *** on our results,ecosystem management and restoration in semi-enclosed subtropical bays should focus on internal waters,which have a poor capacity for water *** Xiangshan Bay,the changes in the Changjiang River estuary ecosystem during the cold season(winter and spring)should also be considered.

关键词： large mesozooplankton long-term changes spatiotemporal heterogeneity Xiangshan Bay

Establishment of ocean dumping area capacity long term changes assessment model

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Establishment of ocean dumping area capacity long term chang...

changes in Spring Snow Cover over the Eastern and Western Tibetan Plateau and Their Associated Mechanism

“全球变化下的海洋与湖沼生态安全”学术交流会

作者： WANG Zhizu ZUO Juncheng XU Ren CHEN Meixiang Key Laboratory of Coastal Disaster and Prevention Ministry of Education Hohai University The State Oceanic Administration the East China Sea Environmental Monitoring Center

Dumping area capacity is mainly affected by the hydrodynamic process（tidal current, storm surges and waves, etc.） and the size of dumping area. Combining with years of dumping amount and depth, discussed the influence of hydrodynamic process and dumping activity on the topography, and based on FVCOM（Finite Volume Coast and Ocean Model） three-dimensional numerical model,a new model of ocean dumping area capacity was built. With the data of depth and dumped amount in the dumping area,and the changes of bottom topographic which caused by tidal current under the natural condition based on the FVCOM hydrodynamic and sediment module,analyzing the relevance of dumping amount, tidal current and bottom topographic changes, the Amendment values was got as the reference value of bottom topographic changes,which affected by wave and storm surges,for evaluating the dumping capacity long term changes. In the premise of setting up the threshold of bottom topographic changes, the dumping area capacity was *** Yangtze Estuary 1# dumping area as an example, when the depth reduce 0.5m / a, the dumping area capacity was about 7000000 m3/ a,the model results were in reasonable agreement with the approval amount. Then the model was validated in Luoyuan bay dumping area, Shengsishangchuanshan dumping area, Dongding dumping area, Dongshan dumping area, and Wenzhou port dumping area, The results were similar to the results of examination.

关键词： Capacity long-term changes Assessment Model FVCOM

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Advances in Atmospheric Sciences 2024年第5期41卷 959-973页

作者： Fangchi LIU Xiaojing JIA Wei DONG Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouZhejiang 310058China

The spring snow cover(SC)over the western Tibetan Plateau(TP)(TPSC)(W_TPSC)and eastern TPSC(E_TPSC)have displayed remarkable decreasing and increasing trends,respectively,during 1985–*** current work investigates the possible mechanisms accounting for these distinct TPSC *** results indicate that the decrease in W_TPSC is primarily attributed to rising temperatures,while the increase in E_TPSC is closely linked to enhanced *** circulation analysis shows that the essential system responsible for the TPSC changes is a significant anticyclonic system centered over the northwestern *** anomalous descending motion and adiabatic heating linked to this anticyclone leads to warmer temperatures and consequent snowmelt over the western ***,anomalous easterly winds along the southern flank of this anticyclone serve to transport additional moisture from the North Pacific,leading to an increase in snowfall over the eastern *** analysis reveals that the anomalous anticyclone is associated with an atmospheric wave pattern that originates from upstream *** warming of the subtropical North Atlantic(NA)sea surface temperature(SST)induces an atmospheric pattern resembling a wave train that travels eastward across the Eurasian continent before reaching the ***,the decline in winter sea ice(SIC)over the Barents Sea exerts a persistent warming influence on the atmosphere,inducing an anomalous atmospheric circulation that propagates southeastward and strengthens the northwest TP anticyclone in ***,an enhancement of subtropical stationary waves has resulted in significant increases in easterly moisture fluxes over the coastal areas of East Asia,which further promotes more snowfall over eastern TP.

关键词： snow cover Tibetan Plateau long-term changes spring

long-term records of glacier evolution and associated proglacial lakes on the Tibetan Plateau(1976‒2020)

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Big Earth Data 2022年第4期6卷 435-452页

作者： Drolma Lhakpa Yubao Qiu Pa Lhak Lijuan Shi Maoce Cheng Bin Cheng Tibet Institute of Plateau Atmospheric and Environmental Sciences Tibet Meteorological BureauLhasaChina Key Laboratory of Atmospheric Environment of Tibet Autonomous Region LhasaTibet Autonomous RegionChina School of Geography and Ocean Science Nanjing UniversityNanjingChina International Research Center of Big Data for Sustainable Development Goals BeijingChina Aerospace Information Research Institute Chinese Academy of SciencesBeijingChina FMI-AIR Joint Research Center for Arctic Observations Finnish Meteorological Institute and Aerospace Information Research InstituteChinese Academy of SciencesSodankyläFinland Climate Center of Tibet Autonomous Region Tibet Meteorological BureauLhasaTibet Autonomous RegionChina School of Earth Resources China University of GeosciencesWuhanChina Finnish Meteorological Institute HelsinkiFinland

The glaciers on the Tibetan Plateau(TP)constitute critical sources of water for the proglacial lakes and many rivers found *** better understand the evolution of glaciers and the impact of this on proglacial lakes,seven glaciers corresponding to continenṅtal,sub-continental,and marine climate types that are influenced by wester-lies and the Indian summer monsoon were selected for *** evolution of the edges of these glaciers and their associated progla-cial lakes were identified based on the visual interpretation of Landsat TM/ETM+/OLI images.A dataset covering the period 1976-2020 that included the glacier and proglacial lake edge vectors was then *** relative errors in the areas of the individual glaciers were less than 3%,and for the proglacial lakes these errors were in the range 0%-7%.The dataset was used to effectively compare the changes in glaciers and proglacial lakes that have occurred over the past four *** most striking changes that were found were the retreat of glaciers and the formation of small proglacial *** dataset could also be used as a proxy to support research on changes in mountain glaciers,particularly their response to climate change and water *** response is of great scientific significance and is important in many applications,including assessments of the ecological problems caused by melting *** dataset can be downloaded from http://***/10.57760/sciencedb.j00076.00131.

关键词： Glacier and proglacial lake long-term changes Landsat Tibetan Plateau

Burial fluxes and sources of organic carbon in sediments of the central Yellow Sea mud area over the past 200 years

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Acta Oceanologica Sinica 2015年第10期34卷 13-22页

作者： YANG Shu YANG Qian LIU Sai CAI Deling QU Keming SUN Yao Key Laboratory for Sustainable Utilization of Marine Fisheries of Ministry of Agriculture Yellow Sea Fisheries Research InstituteChinese Academy of Fishery Sciences

long-term changes of composition, sources and burial fluxes of TOC （total organic carbon） in sediments of the central Yellow Sea mud area and their possible affecting factors are discussed in this paper. Firstly, similarity analysis is employed to confirm that the carbon burial features resulted from two collected cores are typical in the central Yellow Sea mud area where YSWC （Yellow Sea Warm Current） is prevalent. On this basis, the burial flux of TOC here was considered to be 235.5-488.4 pmol/（cm^2.a） since the first industrial revolution, accounting for about 70%-90% among burial fluxes of TC （total carbon） in the sediments. Compared TOC/TC ratio in the two cores with that in other marine sediments worldwide, we suggest that the growth of calcareous/non-calcareous organisms and dissolution of IC （inorganic carbon） are important factors controlling the TOC/TC ratio in sediment. Results of two-end mixed model based on fi13C data indicate that marine-derived organic carbon （OCa） is the main part among total burial organic carbon which accounts for a ratio over 85%. Due to the high TOC/TC ratio in the two cores, TC in the sediments also mainly exists as OCa, and the proportion of OCa is about 60%-80%. Away from the shore and relatively high primary production in upper waters are the main reasons that OCa is predominant among all burial OC in sediments of the central Yellow Sea mud area. Burial of OC in this mud area is probably mainly influenced by the human activities. Although the economic development during the late 19th century caused by the first industrial revolution in China did not obviously increase the TOC burial fluxes in the sediments, the rise of industry and agriculture after the founding of new China has clearly increased the TOC burial flux since 1950s. Otherwise, we also realize that among TC burial fluxes, TIC account for about 10%-30% in sediments of the central Yellow Sea mud area, so its burial could not be simply ignored here. Distinct from TOC

关键词： the central Yellow Sea mud area organic carbon burial flux source long-term changes human activities