CDOM fluorescence of the Laptev Sea and East Siberian Sea surface waters.

This study is focused on CDOM fluorescence of the Laptev Sea and East Siberian Sea surface waters. The preliminary results
are based on ten samples collected along three transects from the estuarine regions of Khatanga, Kolyma and Indigirka rivers
to the continental slope. Fluorescence spectra were recorded in wide ranges of excitation (230-550 nm) and emission
(240-650 nm) wavelengths. Humification and biological/autochthonous indices were calculated in order to determine the degree
of maturation of DOM and autochthonous biological activity in water. Blue shift parameters of CDOM fluorescence
(D270-310; D355-310) for the runoff-influenced surface waters were estimated as (26 nm; 33 nm), (24 nm; 40 nm),
and (25 nm; 36 nm) for the Khatanga, Indigirka, and Kolyma transect, respectively. Desalinated surface waters of the
Laptev Sea were found to be under a strong influence of humic substances, while in case of East Siberian Sea surface waters
CDOM is characterized by a predominance of an autochthonous component. Evolution of CDOM fluorescence within the Laptev Sea
and East Siberian Sea shelf is considered.

本研究聚焦拉普捷夫海与东西伯利亚海表层水体的有色溶解有机物（Chromophoric Dissolved Organic Matter, CDOM）荧光特性。初步研究结果基于沿三条断面采集的10个水样，采样断面覆盖从哈坦加河、科雷马河与因迪吉尔卡河的河口区域至大陆坡海域。荧光光谱的激发波长（230~550 nm）与发射波长（240~650 nm）的扫描区间较宽。为确定水体中溶解有机物（Dissolved Organic Matter, DOM）的成熟度与本土生源活性水平，研究人员计算了腐殖化指数与生物/生源指数。针对受径流影响的表层水体，研究分别估算了其有色溶解有机物荧光的蓝移参数（D270-310；D355-310），其中哈坦加河断面、因迪吉尔卡河断面与科雷马河断面的蓝移参数依次为(26 nm; 33 nm)、(24 nm; 40 nm)与(25 nm; 36 nm)。研究发现，拉普捷夫海的淡化表层水体受到腐殖质的强烈影响，而东西伯利亚海表层水体的有色溶解有机物则以生源组分为主导。本研究还探讨了拉普捷夫海与东西伯利亚海陆架海域内有色溶解有机物荧光的演化过程。