Based on global monthly average data set of sea surface temperature (SST) during 1950 - 1992 and global monthly average 500 hPa height during 1930- 1997 offered by NCARINCEP, the feature of SST anomaly in the Atlantic...Based on global monthly average data set of sea surface temperature (SST) during 1950 - 1992 and global monthly average 500 hPa height during 1930- 1997 offered by NCARINCEP, the feature of SST anomaly in the Atlantic and its relation with summer precipitation over the Northeast China are analyzed. The results show that, the second eigenvector of the SST’s empirical orthogonal expanssion in winter season over the North Atlantic suggests that dist-ibution of SST anomaly has unusual meridional difference; The location of its center is basically identical to center of significant correlation region be- tween summer precipitation over the Northeast China and winter SST in the Atlantic. When winter SST in the North Atlantic is hot in south and cold in north, the blocking situation is stronger in the middle- high latitude. Correspondingly, the blocking high pressure in the northern North Pacific is also getting stronger, the westerlies circulation index in East Asia in next summer would be lower,as a result,more precipitation in the summer would be experienced over Northeast China and vice versa.展开更多
Sea-ice and Sea Surface Temperature in offshore seas are important terms for operational monitoring and forecasting marine environment in China. The software system of regional marine environmental application designe...Sea-ice and Sea Surface Temperature in offshore seas are important terms for operational monitoring and forecasting marine environment in China. The software system of regional marine environmental application designed by author is used for realtime operational monitoring sea-ice, SST, oceanic current and colours and characters of land surface. This software system processes quantitative AVHRR data from NOAA satellite to calculate calibration coefficient, solar angle correction, earth location parameter and atmospheric attenuation correction, then SST field will be produced through calculation using special SST model, and top-quality of colour composite imagery of satellite with variable spacial resolution (1, 2 or 5km) will be produced via image processing. Inside front covor Figure 1 is colour enhanced imagery with 5km resolution of NOAA satellite in offshore展开更多
利用AOML(Atlantic Oceanographical and Meteorological Laboratory)SVP漂流浮标的海表面温度数据,针对30°S以南的南大洋海域,对目前主要使用的微波遥感产品(AMSR-E,Ad-vanced Microwave Scanning Radiometer for the Earth Obser...利用AOML(Atlantic Oceanographical and Meteorological Laboratory)SVP漂流浮标的海表面温度数据,针对30°S以南的南大洋海域,对目前主要使用的微波遥感产品(AMSR-E,Ad-vanced Microwave Scanning Radiometer for the Earth Observing System)反演的SST进行了较为系统的评估。结果表明,AMSR-E SST比浮标数据偏冷,偏差为-0.01℃,标准差为0.70℃。夏季的偏差为0.004℃,标准差为0.64℃;冬季的偏差为-0.06℃,标准差为0.75℃,冬季的偏差和标准差较大。温差ΔT受流速影响,随着流速的增大而减小,且这种趋势在夏季更为显著。具备托伞结构的浮标与总体情况基本一致,而无托伞结构的浮标受流速的影响要大一些。同时,温差ΔT受水汽的影响,随着水汽的增加而减小,且这种影响在冬季更大一些。进一步对4个穿极和绕极浮标的追踪分析表明,温差ΔT受大洋海流系统的影响显著。在海流大的大西洋边界流和南极绕极流中,温差ΔT的不确定性要明显大于总体情况。展开更多
用奇异值分解(Singular Value Decomposition,SVD)方法,给出了四季年代际和年际时间尺度上北大西洋和北太平洋海表温度(Sea Surface Temperature,SST)的显著遥相关。用SVD主模态时间系数构造了海温异常指数I,分析了它们与同期亚太夏季...用奇异值分解(Singular Value Decomposition,SVD)方法,给出了四季年代际和年际时间尺度上北大西洋和北太平洋海表温度(Sea Surface Temperature,SST)的显著遥相关。用SVD主模态时间系数构造了海温异常指数I,分析了它们与同期亚太夏季风和我国东部夏季降水异常的关系。结果表明:两大洋间的SST遥联在年际、年代际时间尺度上都与亚太夏季风相关,其中,年际尺度的两大洋SST遥联与长江流域的降水存在显著相关。展开更多
利用1940—2022年的ERA5再分析资料,探讨了北大西洋海温(sea surface temperature,SST)异常和欧亚大陆西北部表面气温(Northwestern of Eurasia Continent surface air temperature,NWESAT)间相关性质的年代际变化特征及其成因。研究发...利用1940—2022年的ERA5再分析资料,探讨了北大西洋海温(sea surface temperature,SST)异常和欧亚大陆西北部表面气温(Northwestern of Eurasia Continent surface air temperature,NWESAT)间相关性质的年代际变化特征及其成因。研究发现,在1940—1981和2001—2008年北大西洋海温和NWESAT相关性显著,为高相关期,与NWESAT密切相关的海温异常呈马蹄型分布特征,而在低相关期,海温异常则呈三极子型分布特征。进一步研究两者相关性发生变化的原因,发现在高相关期,海温异常的变化超前NWESAT,在该时期北大西洋海温呈马蹄型分布特征,与低相关期相比,湾流区以北海温较高,这为大气提供了更好的水汽条件,更多的降水及更强的高空非绝热加热。同时,湾流上空涡旋介导过程更为活跃,湾流北部高空出现更显著的波源,上述过程均促进了高相关期高空波列的发展。而在低相关期,海温异常主要呈现三极子型分布特征,湾流区以北海温偏低,海洋对大气的影响偏弱,其变化滞后NWESAT。因此,北大西洋海温异常和NWESAT间相关性的年代际变化主要是由北大西洋海温异常分布特征的差异及其对大气波列调制作用的年代际变化所造成。展开更多
文摘Based on global monthly average data set of sea surface temperature (SST) during 1950 - 1992 and global monthly average 500 hPa height during 1930- 1997 offered by NCARINCEP, the feature of SST anomaly in the Atlantic and its relation with summer precipitation over the Northeast China are analyzed. The results show that, the second eigenvector of the SST’s empirical orthogonal expanssion in winter season over the North Atlantic suggests that dist-ibution of SST anomaly has unusual meridional difference; The location of its center is basically identical to center of significant correlation region be- tween summer precipitation over the Northeast China and winter SST in the Atlantic. When winter SST in the North Atlantic is hot in south and cold in north, the blocking situation is stronger in the middle- high latitude. Correspondingly, the blocking high pressure in the northern North Pacific is also getting stronger, the westerlies circulation index in East Asia in next summer would be lower,as a result,more precipitation in the summer would be experienced over Northeast China and vice versa.
文摘Sea-ice and Sea Surface Temperature in offshore seas are important terms for operational monitoring and forecasting marine environment in China. The software system of regional marine environmental application designed by author is used for realtime operational monitoring sea-ice, SST, oceanic current and colours and characters of land surface. This software system processes quantitative AVHRR data from NOAA satellite to calculate calibration coefficient, solar angle correction, earth location parameter and atmospheric attenuation correction, then SST field will be produced through calculation using special SST model, and top-quality of colour composite imagery of satellite with variable spacial resolution (1, 2 or 5km) will be produced via image processing. Inside front covor Figure 1 is colour enhanced imagery with 5km resolution of NOAA satellite in offshore
文摘利用AOML(Atlantic Oceanographical and Meteorological Laboratory)SVP漂流浮标的海表面温度数据,针对30°S以南的南大洋海域,对目前主要使用的微波遥感产品(AMSR-E,Ad-vanced Microwave Scanning Radiometer for the Earth Observing System)反演的SST进行了较为系统的评估。结果表明,AMSR-E SST比浮标数据偏冷,偏差为-0.01℃,标准差为0.70℃。夏季的偏差为0.004℃,标准差为0.64℃;冬季的偏差为-0.06℃,标准差为0.75℃,冬季的偏差和标准差较大。温差ΔT受流速影响,随着流速的增大而减小,且这种趋势在夏季更为显著。具备托伞结构的浮标与总体情况基本一致,而无托伞结构的浮标受流速的影响要大一些。同时,温差ΔT受水汽的影响,随着水汽的增加而减小,且这种影响在冬季更大一些。进一步对4个穿极和绕极浮标的追踪分析表明,温差ΔT受大洋海流系统的影响显著。在海流大的大西洋边界流和南极绕极流中,温差ΔT的不确定性要明显大于总体情况。
文摘用奇异值分解(Singular Value Decomposition,SVD)方法,给出了四季年代际和年际时间尺度上北大西洋和北太平洋海表温度(Sea Surface Temperature,SST)的显著遥相关。用SVD主模态时间系数构造了海温异常指数I,分析了它们与同期亚太夏季风和我国东部夏季降水异常的关系。结果表明:两大洋间的SST遥联在年际、年代际时间尺度上都与亚太夏季风相关,其中,年际尺度的两大洋SST遥联与长江流域的降水存在显著相关。
文摘利用1940—2022年的ERA5再分析资料,探讨了北大西洋海温(sea surface temperature,SST)异常和欧亚大陆西北部表面气温(Northwestern of Eurasia Continent surface air temperature,NWESAT)间相关性质的年代际变化特征及其成因。研究发现,在1940—1981和2001—2008年北大西洋海温和NWESAT相关性显著,为高相关期,与NWESAT密切相关的海温异常呈马蹄型分布特征,而在低相关期,海温异常则呈三极子型分布特征。进一步研究两者相关性发生变化的原因,发现在高相关期,海温异常的变化超前NWESAT,在该时期北大西洋海温呈马蹄型分布特征,与低相关期相比,湾流区以北海温较高,这为大气提供了更好的水汽条件,更多的降水及更强的高空非绝热加热。同时,湾流上空涡旋介导过程更为活跃,湾流北部高空出现更显著的波源,上述过程均促进了高相关期高空波列的发展。而在低相关期,海温异常主要呈现三极子型分布特征,湾流区以北海温偏低,海洋对大气的影响偏弱,其变化滞后NWESAT。因此,北大西洋海温异常和NWESAT间相关性的年代际变化主要是由北大西洋海温异常分布特征的差异及其对大气波列调制作用的年代际变化所造成。
