HOME >> BIOLOGY >> NEWS
Sea level rise threatens marshes in Chesapeake and Delaware Bays

WASHINGTON - Chesapeake and Delaware Bays, the two largest estuaries on the east coast of the United States, are losing marshland to rising sea levels caused by greenhouse warming. Research by University of Maryland scientists suggests that virtually all coastal marshes along these bays could disappear before 2100, if the sea level continues to rise at present rates or higher rates predicted by climate models.

Loss of these marshes would be devastating, the researchers say, due to its effect on the food chain, water quality, and the amount of carbon that would be released into the oceans and atmosphere. Marshes act as carbon sinks, holding it in solid form, so it does not emerge as carbon dioxide gas. The study, by Prof. Michael S. Kearney and colleagues, is reported in the April 16 issue of Eos, a publication of the American Geophysical Union.

Kearney describes a new technique he and his colleagues developed, based on 1993 images from the Thematic Mapper instrument on the Landsat satellite, updated with more recent aerial photography and field surveys. The model measures reflectance from the marsh's soil or sediment layer, its vegetation, and the water, in order to determine its Marsh Surface Condition Index (MSCI), which tracks the overall health of the marsh. A key benefit of the MSCI is that it helps scientists focus on the role of long term sea level rise, without regard to annual variations caused by heavy storms and other transitory phenomena.

In Chesapeake Bay, the greatest degradation of marshes has occurred in the middle portion of its eastern shore at Blackwater Wildlife Refuge. The upper reaches of both Chesapeake and Delaware Bays are less degraded than the middle and lower reaches. This, the researchers say, is due to the smaller amount of river sediment, which helps the upward growth of the marsh, reaching the lower parts of the bays.

In addition, impoundments, which limit stream flows into Delaware Bay from New Jerse
'"/>

Contact: Harvey Leifert
hleifert@agu.org
202-777-7507
American Geophysical Union
11-Apr-2002


Page: 1 2

Related biology news :

1. Blue marlin in gulf have high mercury levels, A&M study shows
2. Flame retardant levels much higher in farmed salmon
3. Excess levels of nitrogen, phosphorus linked to deformed frogs
4. Study: Mothers turn fearless when peptide level drops
5. Briggs takes to the molecular level Darwins findings on plants sensing the direction of light
6. Maternal DHA levels plays important role in infant development
7. Carnegie Mellon neuroscientist develops tool to image brain function at the cellular level
8. Film found on windows after 9/11 reveals higher level of pollutants
9. Published research contains high level of statistical errors
10. Moderate alcohol consumption increases plasma levels of a protective hormone
11. Sediments in many Central Valley streams contain toxic levels of pyrethroid pesticides

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:12/7/2016)... -- BioCatch , the global leader in behavioral biometrics, ... grew to over 40 granted and pending patents. ... , , The Company,s IP ... System, Device, and Method Estimating Force Applied to a Touch Surface, ... costly hardware components needed to estimate the force and pressure applied to ...
(Date:12/7/2016)... 2016   Veridium , a leader in ... new CEO James Stickland . Stickland, a ... experience, has served in senior executive roles for ... in expanding a pipeline of venture capital and ... recently served as managing director of U.K.-based fintech ...
(Date:12/6/2016)... , Dec. 6, 2016 Valencell , the ... it has seen a third consecutive year of triple ... technology in 2016 with a 360 percent increase in ... This increase was driven by sales of its wrist ... interest in its technology for hearables for fitness and ...
Breaking Biology News(10 mins):
(Date:1/19/2017)... ... 2017 , ... DaVita Clinical Research (DCR), a ... device development, and Prism Clinical Research , a leader in providing fully ... Clinical Trials (VCT) has been selected by both companies as an exclusive ...
(Date:1/18/2017)... Portland, OR (PRWEB) , ... January 18, 2017 ... ... modules that provide essential device-to-computer interconnect using USB or PCI Express, announced the ... Altera Cyclone V E FPGA into a compact business-card sized form factor suitable ...
(Date:1/18/2017)... ... January 18, 2017 , ... Executive ... 2017 in its continued commitment to the advancement of the clinical trials segment. ... issues related to clinical trial planning and management. , As executive talent ...
(Date:1/18/2017)... , ... January 18, 2017 , ... Researchers from a new study are ... fall low enough after prostate cancer treatment, this indicates there is still remaining prostate cancer ... mortality. , “ The PSA test has always been an indicator of whether a man’s ...
Breaking Biology Technology:
Cached News: