The physical cause of amplified deep Arctic tropospheric warming in winter in the Barents-Kara Seas （BKS） is examined. The authors propose that changes in the atmospheric circulation patterns are important for deep ...The physical cause of amplified deep Arctic tropospheric warming in winter in the Barents-Kara Seas （BKS） is examined. The authors propose that changes in the atmospheric circulation patterns are important for deep Arctic tropospheric warming in winter. It is found that the retrograde Urals blocking （UB） event concurrent with a negative North Atlantic Oscillation （NAO-） that arises from a prior negative Arctic Oscillation （AO-） is not favorable for tropospheric warming because of less water vapor over the BKS. Such UB events are related to more winter BKS sea ice associated with the negative sea surface temperature （SST） anomaly in the BKS. In contrast, a UB occurring together with a positive North Atlantic Oscillation （NAO~） shows less movement and can significantly enhance tropospheric warming over the BKS through increasing tropospheric sensible heat energy due to a persistent BKS water vapor increase. This type of quasi-stationary UB event is related to prior less BKS sea ice associated with a positive BKS SST anomaly that coexists with the North Atlantic SST tripole structure. In summary, because warm, wet and low sea-ice winters in the BKS are related to UB events with an NAO~, and depend on the winter prior sea-ice condition, the tropospheric warming is to some extent a manifestation of the sea-ice-blocking-moisture feedback in the BKS.展开更多
Methodological approaches to the assessment of natural geo-ecological systems are researched. Analysis of the interaction of natural and anthropogenic components of the geo-ecological systems and their management is b...Methodological approaches to the assessment of natural geo-ecological systems are researched. Analysis of the interaction of natural and anthropogenic components of the geo-ecological systems and their management is based on the consideration of natural-resource potential in the changing spatial and temporal connection. The principles of identifying and mapping of geo-ecological systems of various rank. Structural changes resulting from anthropogenic transformation allow establish the quality of geo-ecosystems and rank according to the degree of self-realization and sustainability.展开更多
基金supported by the National Natural Science Foundation of China[grant number 41430533],[grant number41375067]
文摘The physical cause of amplified deep Arctic tropospheric warming in winter in the Barents-Kara Seas （BKS） is examined. The authors propose that changes in the atmospheric circulation patterns are important for deep Arctic tropospheric warming in winter. It is found that the retrograde Urals blocking （UB） event concurrent with a negative North Atlantic Oscillation （NAO-） that arises from a prior negative Arctic Oscillation （AO-） is not favorable for tropospheric warming because of less water vapor over the BKS. Such UB events are related to more winter BKS sea ice associated with the negative sea surface temperature （SST） anomaly in the BKS. In contrast, a UB occurring together with a positive North Atlantic Oscillation （NAO~） shows less movement and can significantly enhance tropospheric warming over the BKS through increasing tropospheric sensible heat energy due to a persistent BKS water vapor increase. This type of quasi-stationary UB event is related to prior less BKS sea ice associated with a positive BKS SST anomaly that coexists with the North Atlantic SST tripole structure. In summary, because warm, wet and low sea-ice winters in the BKS are related to UB events with an NAO~, and depend on the winter prior sea-ice condition, the tropospheric warming is to some extent a manifestation of the sea-ice-blocking-moisture feedback in the BKS.
文摘Methodological approaches to the assessment of natural geo-ecological systems are researched. Analysis of the interaction of natural and anthropogenic components of the geo-ecological systems and their management is based on the consideration of natural-resource potential in the changing spatial and temporal connection. The principles of identifying and mapping of geo-ecological systems of various rank. Structural changes resulting from anthropogenic transformation allow establish the quality of geo-ecosystems and rank according to the degree of self-realization and sustainability.
