Abstract

The results of streamflow data analysis for 18 mountain catchments in the Yana and Indigirka river basins (1966–2015) with the area from 16.6 to 89600 km² are presented. The average streamflow increased by 13 mm (54%) is September, by 1.5 mm (57%) in October, by 0.4 mm (59%) in November, and by 0.1 mm (80%) in December on 12, 11, 9, and 7 rivers, respectively. Basically, the streamflow variations are manifested in the form of abrupt shifts during 1991–1996. There is a decrease in precipitation in winter (by 8–13 mm) and the absence of significant changes in the other seasons. An increase in average annual air temperature by 2.0°C led to an increase in the amount of liquid precipitation and streamflow in September by about 12 mm. The revealed dependences of monthly streamflow on the amount of liquid precipitation in September for small catchments (as well as the single period (1991–1996), when the simultaneous variations in these hydrometeorological parameters are observed) indicate that the phase state of precipitation is the main factor of changes in the low flow for the analyzed rivers.

中文翻译：

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Yana和Indigirka流域降水的相态作为低流量的因素

摘要

亚纳河和英迪吉尔卡河流域（1966-2015年）的18个山区集水区（16.6至89600 km ²）的流量数据分析结果被提出。9月的平均流量增加了13毫米（54％），10月增加了1.5毫米（57％），11月增加了0.4毫米（59％），12月，11、9和12月增加了0.1 mm（80％）和7条河流。基本上，流量的变化在1991-1996年间以突变的形式表现出来。冬季降水减少（减少了8-13毫米），而其他季节则没有明显变化。年平均气温升高2.0°C，导致9月份的液体沉淀和水流增加了约12毫米。揭示小流域（以及单个时期（1991-1996年））9月的月流量对液状降水量的依赖性，