Details:

Journal Title:
JAWRA Journal of the American Water Resources Association
Personal Author:
Cai, Xun ; Shen, Jian ; Zhang, Yinglong J. ; Qin, Qubin ; Wang, Zhengui ; ... More +
Cai, Xun ; Shen, Jian ; Zhang, Yinglong J. ; Qin, Qubin ; Wang, Zhengui ; Wang, Harry Less -
NOAA Program & Office:
NOS (National Ocean Service)
Description:
In this study, the influence of sea‐level rise (SLR) on seasonal hypoxia and phytoplankton production in Chesapeake Bay is investigated using a 3D unstructured grid model. Three SLR scenarios (0.17, 0.5, and 1.0 m) were conducted from 1991 to 1995. Results show that the summer hypoxic volume (HV) increases about 2%, 8%, and 16%, respectively, for these three scenarios, compared with Base Scenario. The contributions of physical and biological processes on the increase in the HV were analyzed. With the projected SLR, enhanced gravitational circulation transports more oxygen‐rich water in the bottom layer from the mouth. However, the pycnocline moves upwards along with increasing water depth, which largely prolongs the time for dissolved oxygen (DO) to be transported to the bottom. The altered physical processes contribute greatly to a larger HV bay‐wide. Besides, SLR increases the whole Bay phytoplankton production, with a larger increase in shallow areas (e.g., 53% in areas with depth <1 m under SLR of 0.5 m). Enhanced light availability is suggested to be the major driver of blooming phytoplankton under SLR in shallow areas. While increased DO production over the euphotic zone is mostly released to the atmosphere and transported downstream, the increase in settled organic matter greatly promotes DO consumption in the water column. The increased respiration is another major cause of the HV increase besides the physical contributions.
Keywords:
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Earth-Surface Processes Ecology Water Science And Technology
Source:
JAWRA Journal of the American Water Resources Association, 58(6), 922-939
DOI:
https://doi.org/10.1111/1752-1688.12921
ISSN:
1093-474X;1752-1688;
Format:
PDF
Publisher:
Wiley
Document Type:
Journal Article
Funding:
Grant no. NA20NOS4200205
Rights Information:
Accepted Manuscript
Compliance:
Library
Main Document Checksum:
[+]
urn:sha256:0afe7ba7bae8c640caf76414b866f9e7f4a83ae551f8fb794d3e3cfa08a0df07
Download URL:
https://repository.library.noaa.gov/view/noaa/57040/noaa_57040_DS1.pdf
File Type:

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