Trends in cloud amount and radiative fluxes at Syowa Station, Antarctica
Trends in cloud amount and radiative fluxes at Syowa Station, Antarctica
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DOI：
10.1016/j.polar.2007.04.001
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发表时间：
2007-08
期刊：
影响因子：
1.8
通讯作者：
T. Yamanouchi;Yasuo Shudou
中科院分区：
文献类型：
--
作者：
T. Yamanouchi;Yasuo Shudou
云量和辐射通量的变化是与最近北极和南极气候变化有关的一个讨论问题。最近发现的“由暗变亮”也引起了极大的关注。基于卫星数据进行了讨论，但最近长期以来，从地面站数据中没有得到可靠的结果。在南极洲的昭和站，气象观测已持续了近50年。在这一时期，年平均云量以0.014/年的速度逐渐增加。自1991年以来，作为BSRN站之一观测辐射收支。比较了1991 - 2004年各月平均辐射通量与云量的变化趋势，发现两者之间存在一致的关系。计算了云辐射强迫。12月净长波和净总量呈下降趋势，净短波呈上升趋势，均与该月云量减少相对应。另一方面，在6月，净长波强迫的上升趋势，对应于云量的增加。平均而言，雪娃站的云辐射强迫代表了南极海冰区附近沿海站的云辐射强迫。
Variations of cloud amount and radiative fluxes are a matter of discussion related to the recent climate change in the Arctic and Antarctic. It is also of great concern related to “from dimming to brightening” recently found. Discussions based on satellite data had been conducted; however, no solid results are obtained from the surface station data for a long term in the recent. At Syowa Station, Antarctica, meteorological observation has been continued for nearly 50 years. During this term, an annual mean cloud amount showed a gradual increase at a rate of 0.014/yr. Radiation budget was observed since 1991 as one of the BSRN stations. Trends of monthly mean radiative fluxes were compared with those of cloud amount and conformable relations were seen during the period from 1991 to 2004. A cloud radiative forcing was estimated. In December, a downward trend in net longwave and net total appeared, while an upward trend in net shortwave was seen, and all corresponded to the decrease of cloud amount in this month. On the other hand in June, an upward trend in net longwave forcing was seen, corresponding to the increase of cloud amount. On an average, cloud radiative forcings at Syowa Station represented those of Antarctic costal stations near sea ice area.