Recent variations in surface specific humidity in the warm season over Japan.
Recent variations in surface specific humidity in the warm season over Japan.
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日本暖季地表比湿度的最新变化。
DOI：
10.1007/s00704-015-1402-5
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Iwasaki H.
中科院分区：
文献类型：
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作者：
小室悠紀;鈴木利孝;大沼友貴彦;箕輪昌紘;山崎哲秀;的場澄人;藤田耕史;平林幹啓;本山秀明;青木輝夫;Iwasaki H.
利用日本气象厅150个气象观测站34年(1976-2009年)的资料，研究了日本地表比湿度(Qsfc)暖季节平均值的近期变化。日本上空平均的暖季节平均当地标准时间(UTC + 9小时)的区域趋势显著增加，相对湿度变化不大：每100a年增加速度为+1.93g/kg。使用四次每日数据计算的温暖季节平均值日本略有增加：每100年增加幅度为+0.95g/kg。利用日四次资料计算，约16%的台站暖季平均值有明显增加的趋势，这些台站集中在日本东部。在40%的站点上，平均qsfcat 3 LST的增加趋势比当地其他时间更明显。平均日循环在第1期(1976-1992年)达到最大值的本地时间为15LST，而在第2期(1993-2009年)则有推迟到21LST的趋势。此外，在热力诱导的局地环流较发达的日子里，沿海和山区的平均夜间活动增加的速度较大。
Recent variations in the warm seasonal mean of surface specific humidity (qsfc) in Japan were studied using 34 years of data (1976–2009) from 150 meteorological observation stations of the Japan Meteorological Agency. The regional trend in the warm seasonal meanqsfcat 3 local standard time (LST) (UTC + 9 h), averaged over Japan, increased significantly with small changes in the relative humidity: the rate of increase was +1.93 g/kg per 100 years. The warm seasonal meanqsfcover Japan, calculated using four-times-daily data, increased slightly: the rate of increase was +0.95 g/kg per 100 years. About 16 % of the stations exhibited a significant increasing trend in warm seasonal meanqsfccalculated using four-times-daily data; these stations were concentrated in eastern Japan. The increasing trends at 40 % of the stations were more evident for the meanqsfcat 3 LST than at other local times. The local time at which the diurnal cycle of the meanqsfcreached a maximum was 15 LST in period 1 (1976–1992) and tended to be delayed until up to 21 LST in the interior in period 2 (1993–2009). In addition, the rate of increase in meanqsfcat nighttime was larger around the coastal and mountainous areas on days with well-developed thermally induced local circulation.