shifts in stream hydrochemistry in responses to typhoon and non-typhoon precipitation
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ID: 135408
2018
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Abstract
Climate change is projected to increase the intensity and
frequency of extreme climatic events such as tropical cyclones. However, few
studies have examined the responses of hydrochemical processes to climate
extremes. To fill this knowledge gap, we compared the relationship between
stream discharge and ion input–output budget during typhoon and non-typhoon
periods in four subtropical mountain watersheds with different levels of
agricultural land cover in northern Taiwan. The results indicated that the
high predictability of ion input–output budgets using stream discharge
during the non-typhoon period largely disappeared during the typhoon periods. For ions
such as Na+, NH4+, and PO43−, the typhoon period and
non-typhoon period exhibited opposite discharge–budget relationships. In
other cases, the discharge–budget relationship was driven by the typhoon
period, which consisted of only 7 % of the total time period. The
striking differences in the discharge–ion budget relationship between the two
periods likely resulted from differences in the relative contributions of
surface runoff, subsurface runoff and groundwater, which had different
chemical compositions, to stream discharge between the two periods.
Watersheds with a 17–22 % tea plantation cover showed large increases in
NO3− export with increases in stream discharge. In contrast,
watersheds with 93–99 % forest cover showed very mild or no increases in
NO3− export with increases in discharge and very low levels of
NO3− export even during typhoon storms. The results suggest that even
mild disruption of the natural vegetation could largely alter hydrochemical
processes. Our study clearly illustrates significant shifts in hydrochemical
responses between regular and typhoon precipitation. We propose that
hydrological models should separate hydrochemical processes into regular and
extreme conditions to better capture the whole spectrum of hydrochemical
responses to a variety of climate conditions.
| Reference Key |
chang2018biogeosciencesshifts
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|---|---|
| Authors | ;C.-T. Chang;J.-C. Huang;L. Wang;Y.-T. Shih;T.-C. Lin |
| Journal | tetrahedron letters |
| Year | 2018 |
| DOI |
10.5194/bg-15-2379-2018
|
| URL | |
| Keywords |
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