Abstract

The changes in the thermal regime of the Upper Kolyma rivers in the permafrost zone in 1981–2010 are discussed. Over the recent three decades the normals of the dates of the springtime 0.2°C water temperature crossing have shifted by 3–13 days earlier due to the climate warming. Average long-term water temperatures in the first half of summer increased by 1.4–1.6°C. In autumn, the 0.2°C crossing occurs on average by 9 days later. This agrees with an increase in air temperature normals. However, in the second half of the warm period, annual mean water temperatures dropped by 0.7–1.5°C. Such abnormal response to climate change is caused by the involvement of an additional volume of chilled water to the river flow due to the thawing of permafrost and the expansion of taliks in August and September.

中文翻译：

---

多年冻土区山区河流热状况的现代变化（以科利马河上游为例）

摘要

讨论了1981-2010年冻土带上科利马河上游的热状况变化。在最近的三十年中，由于气候变暖，春季0.2°C水温跨度的正常日期提前了3-13天。夏季上半年的平均长期水温升高了1.4–1.6°C。在秋天，平均0.2°C发生在9天后。这与气温正常值的升高是一致的。但是，在温暖期的后半段，年平均水温下降了0.7–1.5°C。这种对气候变化的异常反应是由于多年冻土融化和8月和9月滑石粉膨胀导致河水流量增加而引起的。