Extreme storms drive riverine particulate organic matter export from tropical mountians of estern Puerto Rico
|Authors:||Kathryn E Clark Robert Stallard Martha Scholl Alain F. Plante Sheila F. Murphy Grizelle Gonzalez William H. McDowell|
|Storage:||The size of this resource is 138.3 MB|
|Created:||Jun 23, 2017 at 7:37 p.m.|
|Last updated:|| Sep 29, 2017 at 8:10 p.m.
|Citation:||See how to cite this resource|
Erosion, transport and deposition of riverine suspended load are pivotal processes in the terrestrial carbon cycle and function of the critical zone. In order to better understand the response of these drivers to changes in land cover and climate, it is critical to characterize these drivers. In montane rivers, such as the Luquillo Mountains, Puerto Rico, extreme storm events erode and transport clastic and organic material from mountain slopes to rivers, dominating annual export. Riverine particulate organic carbon (POC) and particulate nitrogen (PN) exports are not as well understood, especially at high runoff rates. Over 25 years, river POC export was 75±20 tC km-2 yr-1 for Rio Icacos and 22±8 tC km-2 yr-1 for the Mameyes. Caribbean river POC yields were higher in relation to their SS yields, suggesting that these rivers have greater terrestrial OM supply on the landscape to be eroded and transported into rivers, than what is expected based on data for world rivers. Additionally, we determined that 50% of the suspended load flux occurred during extreme rainfall events, spanning just over 2 days a year, but only exporting <10% of the annual runoff and rainfall. These results emphasize the important role of extreme rainfall events as drivers of POM export from the Luquillo Mountains.
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Resource Level Coverage
|MAM_Ylds_SCN_particulates||1991 to 2015 yields of runoff, SS, POC, and PN using LOADEst|
|ICA_Ylds_SCN_problem_data_particulates||1991 to 2015 yields of runoff, SS, POC, and PN using LOADEst|
|ICA_Storms_particulate, MAM_Storms_particulate - Excel||n = 127 with > 80 mm rainfall / event and the flux of rainfall, runoff, SS, POC, and PN|
|ICA_GAGE_YEARS, MAM_GAGE_YEARS - zip and text files||gap filled 1991 to 2014 instantaneous discharge, original data found online|
|Events_Icacos_data - Excel||> 0.16 mm rainfall / event at Rio Icacos rain gauge, published: 10.1002/2013WR014413|
|PR_SS_POC_PN - Excel||n = 2489 SS mg/L samples collected using ISCOs during storm events from 1991 to 2004, n = 1793 SS mg/L samples collected weekly from 1989 to 2015, n = 302 results of C%, N%, POC & PN mg/L, C/N. Includes SS mg/L & discharge, USGS 1992 to 1998, LCZO 2006 to 2015 n = 1624 SS samples burned for LOI mg/L 1994 to 2004|
This resource was created using funding from the following sources:
|Agency Name||Award Title||Award Number|
|NSF||CZO: Luquillo Critical Zone Observatory||1331841|
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