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:5/20/2016)... , May 20, 2016  VoiceIt is ... partnership with VoicePass. By working together, ... experience.  Because VoiceIt and VoicePass take slightly different ... engines increases both security and usability. ... excitement about this new partnership. "This ...
(Date:5/3/2016)... 3, 2016  Neurotechnology, a provider of high-precision ... Automated Biometric Identification System (ABIS) , a complete ... MegaMatcher ABIS can process multiple complex biometric transactions ... of fingerprint, face or iris biometrics. It leverages ... and MegaMatcher Accelerator , which have been ...
(Date:4/26/2016)... April 27, 2016 Research ... Multi-modal Biometrics Market 2016-2020"  report to their offering.  ... The analysts forecast the global multimodal ... 15.49% during the period 2016-2020.  Multimodal ... sectors such as the healthcare, BFSI, transportation, automotive, ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... June 23, 2016 A person commits a crime, ... scene to track the criminal down. An outbreak ... and Drug Administration (FDA) uses DNA evidence to track down ... Sound far-fetched? It,s not. The FDA has increasingly used ... investigations of foodborne illnesses. Put as simply as possible, whole ...
(Date:6/23/2016)... , June 23, 2016  The Prostate Cancer Foundation (PCF) ... precise treatments and faster cures for prostate cancer. Members of the Class of ... 15 countries. Read More About the Class of 2016 ... ... ...
(Date:6/23/2016)... ... 2016 , ... Supplyframe, the Industry Network for electronics hardware ... . Located in Pasadena, Calif., the Design Lab’s mission is to bring together ... built and brought to market. , The Design Lab is Supplyframe’s physical representation ...
(Date:6/23/2016)... 23, 2016 Apellis Pharmaceuticals, Inc. today ... trials of its complement C3 inhibitor, APL-2. The ... ascending dose studies designed to assess the safety, ... injection in healthy adult volunteers. Forty ... a single dose (ranging from 45 to 1,440mg) ...
Breaking Biology Technology:
Cached News: