Item talk:Q228575

{

 "@context": "http://schema.org/",
 "@type": "WebPage",
 "additionalType": "Project",
 "url": "https://www.usgs.gov/programs/climate-research-and-development-program/science/climate-change-hydrologic-responses-and",
 "headline": "Climate Change, Hydrologic Responses and Impacts on Carbon Cycling as Inferred by Changes in Fluvial Dissolved Organic Carbon Fluxes",
 "datePublished": "November 28, 2018",
 "author": [
   {
     "@type": "Person",
     "name": "Thomas G Huntington, Ph.D.",
     "url": "https://www.usgs.gov/staff-profiles/thomas-g-huntington"
   }
 ],
 "description": [
   {
     "@type": "TextObject",
     "text": "Figure 1:"
   },
   {
     "@type": "TextObject",
     "text": "Why this Research is Important: The evidence suggests that the global hydrologic cycle is intensifying (Huntington, 2006, 2010). The intensity of the water cycle increased over most of the conterminous United States between the periods 1945 to 1974 and 1985 to 2014 (Figure 1, Huntington and others, 2018). In the northeastern U.S. this hydrologic response to climate change includes an increase in precipitation and runoff and is projected to result in substantial changes in the seasonal delivery of water and organic carbon to the near-coastal ocean, and to an increase in summer drought severity. These hydrologic changes are altering the timing and magnitude of the delivery of DOC to the Gulf of Maine. Evidence suggests that increasing discharge is affecting nutrient inputs to the Gulf of Maine and that increasing export of DOC may be reducing light absorption by phytoplankton reducing primary productivity that could ultimately affect fisheries in the region. There are also concerns that increasing export of freshwater and DOC may be exacerbating ongoing ocean acidification and the harmful algal blooms (Figure 2)."
   },
   {
     "@type": "TextObject",
     "text": "Objective(s): The project objectives include investigation of the links between terrestrial and marine carbon cycling by studying the fluvial transport of freshwater and dissolved organic carbon. The primary goal is to improve our understanding of how changes in climate are affecting the export of freshwater and dissolved organic carbon to the near-coastal ocean."
   },
   {
     "@type": "TextObject",
     "text": "If it is shown that the concentration discharge relations for DOC has changed over time this would indicate fundamental changes in carbon cycle processes including rates of microbial decomposition of soil organic carbon (SOC), primary production, or the partitioning of SOC decomposition into DOC or CO2."
   },
   {
     "@type": "TextObject",
     "text": "Figure 2:"
   },
   {
     "@type": "TextObject",
     "text": "Methods: The project uses non-parametric time-series analysis to investigate historical and future projected trends in precipitation, runoff, and evapotranspiration over large watershed at the regional and continental scale. Through a partnership with other USGS researchers (Greg McCabe, Dave Wolock, and Peter Weiskel) this project employs a water-balance model in conjunction with climate and soils data to investigate historical changes in water cycle intensity defined as precipitation plus actual evapotranspiration."
   },
   {
     "@type": "TextObject",
     "text": "This project employs the LOADEST regression model to estimate riverine dissolved organic carbon (DOC) fluxes (loads) exported to the near coastal ocean. Regression modeling is also used to study the relative importance of climate and landscape variables in controlling the carbon yield from individual rivers. In partnership with research scientists at the University of Massachusetts, Boston this project is studying DOC export from the Penobscot River using the Regional Hydro-Ecologic Simulation System (RHESSys) model."
   },
   {
     "@type": "TextObject",
     "text": "Statement of Problem: This project is studying how ongoing and projected changes in climate are, or will likely, affect the export of freshwater and dissolved organic carbon (DOC) to the near-coastal ocean.  This project is also examining the fate of DOC in rivers to address questions of whether DOC is transported conservatively or whether a substantial fraction of DOC is lost through biotic or abiotic processes during transport in rivers.  Additionally, it is investigating whether concentration discharge (C-Q) relations for DOC may have changed over time that could indicate that the fundamental C-Q relation, that is generally assumed to be stationary, has changed."
   },
   {
     "@type": "TextObject",
     "text": "This project investigates the links between terrestrial and marine carbon cycling and fluvial transport of freshwater and dissolved organic carbon (DOC) to the near-coastal ocean. The project analyzes DOC export that integrates complex interacting processes in natural and human-impacted terrestrial and aquatic environments. Changes in DOC export may indicate changes in terrestrial ecosystem carbon cycling that are difficult to quantify directly but that may affect exchanges between the biosphere, geosphere, and atmosphere. Detecting changes in DOC export can provide insight into ongoing changes in terrestrial carbon cycling. In northern temperate forested ecosystems changes in carbon export may reflect a shift from carbon sink to carbon source or vice versa. Changes in freshwater and carbon export can influence aquatic and marine biogeochemical processes including eutrophication, hypoxia, carbon sequestration or release, ocean acidification, and ocean net primary productivity. This project examines the controls on the fluvial export of terrestrially-derived DOC including climatic variability and landscape variables."
   }
 ],
 "funder": {
   "@type": "Organization",
   "name": "Climate Research and Development Program",
   "url": "https://www.usgs.gov/programs/climate-research-and-development-program"
 },
 "about": [
   {
     "@type": "Thing",
     "name": "Science Technology"
   },
   {
     "@type": "Thing",
     "name": "Methods and Analysis"
   },
   {
     "@type": "Thing",
     "name": "Oceans and Estuaries"
   },
   {
     "@type": "Thing",
     "name": "Climate"
   },
   {
     "@type": "Thing",
     "name": "Energy"
   },
   {
     "@type": "Thing",
     "name": "Water"
   },
   {
     "@type": "Thing",
     "name": "Environmental Health"
   },
   {
     "@type": "Thing",
     "name": "Water Cycle"
   },
   {
     "@type": "Thing",
     "name": "runoff"
   },
   {
     "@type": "Thing",
     "name": "Dissolved Organic Carbon"
   },
   {
     "@type": "Thing",
     "name": "Information Systems"
   },
   {
     "@type": "Thing",
     "name": "Forests"
   },
   {
     "@type": "Thing",
     "name": "Water Quality and Quantity"
   },
   {
     "@type": "Thing",
     "name": "Cycling of Carbon and Nutrients"
   },
   {
     "@type": "Thing",
     "name": "Biogeochemical Cycling"
   },
   {
     "@type": "Thing",
     "name": "Climate Change"
   },
   {
     "@type": "Thing",
     "name": "Hydrologic Change"
   },
   {
     "@type": "Thing",
     "name": "Geology"
   }
 ]

}