El Niño-Driven Dry Season Flushing Enhances Dissolved Organic Matter Export From a Subtropical Watershed
| Autor: | Liyin Qu, Weidong Guo, Nengwang Chen, Aron Stubbins, Yufang Wu, Yan Li, Randy A. Dahlgren |
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| Rok vydání: | 2020 |
| Předmět: |
Wet season
Watershed 010504 meteorology & atmospheric sciences Life on Land seasonal shunting Subtropics 010502 geochemistry & geophysics 01 natural sciences Carbon cycle sensor Dissolved organic carbon Dry season Meteorology & Atmospheric Sciences DOM 0105 earth and related environmental sciences geography geography.geographical_feature_category Discharge Estuary rainstorm events flux Geophysics Oceanography General Earth and Planetary Sciences Environmental science El Nino |
| Zdroj: | Geophysical Research Letters, vol 47, iss 19 |
| Popis: | Author(s): Qu, L; Wu, Y; Li, Y; Stubbins, A; Dahlgren, RA; Chen, N; Guo, W | Abstract: The 2015/2016 super El Nino event resulted in a positive precipitation anomaly during dry seasons in the Jiulong River watershed, southeast China. Four years (2014–2017) of high frequency, in situ humic-like fluorescent DOM (FDOMH) data in the Jiulong Estuary were coupled with extrapolation to a freshwater end-member FDOMH concentration and river discharge data to estimate riverine FDOMH export. The wetter El Nino dry season was followed by lower FDOMH export during the subsequent wet season. Furthermore, in the dry season after El Nino reached its strongest phase, a 90–187% increase in FDOMH export occurred. If widespread, this pattern suggests El Nino events may enhance export of FDOMH from south China rivers in dry seasons resulting in seasonal and annual shunting of the terrestrial DOM export, modulating coastal carbon cycling. This study highlights the need to incorporate climate-driven regulation patterns on DOM transport across the land-ocean interface. |
| Databáze: | OpenAIRE |
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