Estuaries and Coasts

, Volume 34, Issue 6, pp 1293–1309 | Cite as

Long-Term Trends in Chesapeake Bay Seasonal Hypoxia, Stratification, and Nutrient Loading

  • Rebecca R. Murphy
  • W. Michael Kemp
  • William P. Ball
Article

Abstract

A previously observed shift in the relationship between Chesapeake Bay hypoxia and nitrogen loading has pressing implications on the efficacy of nutrient management. Detailed temporal analyses of long-term hypoxia, nitrogen loads, and stratification were conducted to reveal different within-summer trends and understand more clearly the relative role of physical conditions. Evaluation of a 60-year record of hypoxic volumes demonstrated significant increases in early summer hypoxia, but a slight decrease in late summer hypoxia. The early summer hypoxia trend is related to an increase in Bay stratification strength during June from 1985 to 2009, while the late summer hypoxia trend matches the recently decreasing nitrogen loads. Additional results show how the duration of summertime hypoxia is significantly related to nitrogen loading, and how large-scale climatic forces may be responsible for the early summer increases. Thus, despite intra-summer differences in primary controls on hypoxia, continuing nutrient reduction remains critically important for achieving improvements in Bay water quality.

Keywords

Hypoxia Stratification Nutrients Chesapeake Bay Kriging Long-term trends 

Supplementary material

12237_2011_9413_MOESM1_ESM.doc (12.8 mb)
(DOC 12.7 mb)

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Copyright information

© Coastal and Estuarine Research Federation 2011

Authors and Affiliations

  • Rebecca R. Murphy
    • 1
  • W. Michael Kemp
    • 2
  • William P. Ball
    • 1
  1. 1.Department of Geography and Environmental EngineeringJohns Hopkins UniversityBaltimoreUSA
  2. 2.Horn Point Laboratory, Center for Environmental ScienceUniversity of MarylandCambridgeUSA

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