Revising contemporary heat flux estimates for the Lena River, Northern Eurasia
Revising contemporary heat flux estimates for the Lena River, Northern Eurasia
复制标题
修改欧亚大陆北部勒拿河的当代热通量估计
DOI：
10.31223/osf.io/436dh
复制
发表时间：
2019
影响因子：
2.7
通讯作者：
V. Fofonova
中科院分区：
文献类型：
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作者：
N. Tananaev;A. Georgiadi;V. Fofonova
勒拿河 (Lena R.) 热通量影响拉普捷夫海水文。根据河流出口处 Kyusyur 的数据，已发布的长期估计范围为 14.0 至 15.7 EJ·a−1。使用新颖的每日河流温度 (Tw) 数据集来评估当代 Lena R. 热通量，其值为 16.4 ± 2.7 EJ·a−1 (2002–2011)，证实了 Tw 和水径流的上升趋势。然而，我们来自 Kyusyur 的现场数据显示，与横截面平均 Tw 相比，Kyusyur 观测到的 Tw 值存在显着的负偏差，即 -0.8 °C。 Lena R. 小支流在 7 月至 9 月期间排放较冷的水，形成影响 Kyusyur Tw 数据的冷急流。主要的 Tw 负峰值大多与这些支流之一叶列梅卡河的洪水峰值一致。我们的重新评估中考虑到了这种负面偏见。修正后的当代 Lena R. 热通量为 17.6 ± 2.8 EJ·a−1 (2002-2011)，并使用来自 Kyusyur 上游约 500 公里的日甘斯克 (Zhigansk) 的数据从上方限制为 26.9 EJ·a−1。 6月淡水期热通量受河流温度控制，而7月下旬至9月中旬，径流是主导因素。
The Lena River (Lena R.) heat flux affects the Laptev Sea hydrology. Published long-term estimates range from 14.0 to 15.7 EJ·a−1, based on data from Kyusyur, at the river outlet. A novel daily stream temperature (Tw) dataset was used to evaluate contemporary Lena R. heat flux, which is 16.4 ± 2.7 EJ·a−1 (2002–2011), confirming upward trends in both Tw and water runoff. Our field data from Kyusyur, however, reveal a significant negative bias, −0.8 °C in our observations, in observed Tw values from Kyusyur compared to the cross-section average Tw. Minor Lena R. tributaries discharge colder water during July–September, forming a cold jet affecting Kyusyur Tw data. Major Tw negative peaks mostly coincide with flood peaks on the Yeremeyka River, one of these tributaries. This negative bias was accounted for in our reassessment. Revised contemporary Lena R. heat flux is 17.6 ± 2.8 EJ·a−1 (2002–2011) and is constrained from above at 26.9 EJ·a−1 using data from Zhigansk, approximately 500 km upstream Kyusyur. Heat flux is controlled by stream temperature in June, during the freshet period, while from late July to mid-September, water runoff is a dominant factor.
气候变化下北极陆地河流水体变暖
DOI：
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发表时间：
2018
期刊：
影响因子：
--
作者：
Park Hotaek;Yoshikawa Yasuhiro;Oshima Kazuhiro;Yang Daqing
通讯作者：
Yang Daqing