Climate change in Maryland

Climate change in Maryland
Adam Peterson · CC BY-SA 4.0 · source
Name	Maryland
Capitol	Annapolis
Largest city	Baltimore
Population	6,177,224
Area sq mi	12,406

Climate change in Maryland

Maryland faces accelerating sea level rise and warming that affect the Chesapeake Bay, coastal communities such as Ocean City and Cambridge, and urban centers including Baltimore. Observed trends recorded by the National Oceanic and Atmospheric Administration and modeled by the Intergovernmental Panel on Climate Change indicate increased heat, heavier precipitation in places like Hagerstown and Salisbury, and ecological shifts impacting species from blue crab fisheries to migratory birds visiting Assateague Island. State and local responses involve the Maryland Department of the Environment, the Maryland Department of Natural Resources, and municipal plans for resilience in Baltimore, Annapolis, and Prince George's County.

Overview

Maryland spans coastal plains, the Chesapeake Bay watershed, and the Appalachian Ridge-and-Valley region around Cumberland and Western Maryland, creating diverse vulnerabilities documented by the U.S. Global Change Research Program, the University of Maryland, and the Maryland Commission on Climate Change. The state's economy, including ports such as the Port of Baltimore, agriculture in Queen Anne's County and Caroline County, and tourism in Ocean City and St. Michaels, intersects with federal programs from the Environmental Protection Agency and regional planning entities like the Chesapeake Bay Program. Historical storms such as Hurricane Isabel and Hurricane Sandy illustrate acute hazards alongside chronic trends recorded at tide gauges in Solomons and Tolchester Beach.

Observed and Projected Climate Changes

Instrumental records from NOAA tide gauges and the National Aeronautics and Space Administration show Maryland has warmed, with more frequent days above 95 °F in Baltimore and the Eastern Shore, and reduced freeze days in Frederick County and Montgomery County. Climate projections used by the Maryland Department of the Environment and academic centers like the University of Maryland Center for Environmental Science anticipate further warming under RCP scenarios and emissions pathways assessed by the Intergovernmental Panel on Climate Change, with more intense precipitation events impacting Baltimore City sewer systems and causing flash floods in Howard County. Sea level rise projections cited by the Maryland Commission on Climate Change and the Annapolis Climate Action Plan estimate multiple feet of local rise by 2100, exacerbated by subsidence along the Eastern Shore near Dorchester County and Wicomico County.

Impacts on Ecosystems and Biodiversity

Warming waters and changing salinity in the Chesapeake Bay disrupt habitats for blue crab, oyster, and menhaden populations monitored by the Maryland Department of Natural Resources. Tidal marsh loss in areas like Blackwater National Wildlife Refuge threatens species such as the Delmarva fox squirrel and breeding grounds for migratory shorebirds that use Stopover sites along the Atlantic Flyway, including Assateague Island and Chincoteague National Wildlife Refuge. Forest composition shifts documented in Catoctin Mountain Park and the C&O Canal National Historical Park may favor oak and hickory over cooler-adapted species, altering habitat for mammals like the white-tailed deer and avifauna recorded by the Audubon Society. Invasive species and pests—including infestations linked to warmer winters affecting the gypsy moth and the spread of ticks transmitting Lyme disease—have been reported by the Maryland Department of Health and entomologists at the Smithsonian Environmental Research Center.

Sea Level Rise and Coastal Impacts

Rising seas threaten the Eastern Shore, barrier islands such as Assateague Island, and maritime communities including Cambridge and Talbot County. Erosion, saltwater intrusion into aquifers supplying water to towns like Chestertown and agricultural fields in Wicomico County, and loss of wetlands documented by the U.S. Fish and Wildlife Service reduce natural storm buffering and biodiversity in sites like Poplar Island. The Port of Baltimore faces operational risks from storm surge and tidal flooding, prompting adaptation measures coordinated with federal partners such as the U.S. Army Corps of Engineers and regional groups like the Chesapeake Bay Foundation.

Impacts on Agriculture, Forestry, and Fisheries

Maryland's poultry and grain producers in Carroll County and Queen Anne's County contend with heat stress, altered growing seasons, and increased disease pressures monitored by the University of Maryland Extension and the U.S. Department of Agriculture. Aquaculture and wild-harvest fisheries for blue crab and oyster industries monitored by the Maryland Seafood Marketing Program and the Maryland Department of Natural Resources face recruitment failures linked to warming and hypoxia in the Chesapeake Bay. Forestry operations in the western highlands around Allegany County confront changing pest regimes and wildfire risks, prompting management responses from the Maryland Forest Service and conservation groups like The Nature Conservancy.

Public Health and Vulnerable Communities

Heat waves in urban heat islands such as Baltimore disproportionately affect older adults in neighborhoods like Sandtown-Winchester and low-income residents in Prince George's County, with public health monitoring by the Maryland Department of Health and hospitals including Johns Hopkins Hospital. Flood-prone communities on the Eastern Shore, including populations in Dorchester County, face displacement risks similar to cases studied by Harvard University and community organizations such as Maryland PIRG. Vector-borne diseases such as Lyme disease and West Nile virus tracked by the Centers for Disease Control and Prevention show changing seasonality, and air quality episodes linked to increased ozone stress respiratory patients served by institutions like University of Maryland Medical Center.

State Policy, Planning, and Mitigation Efforts

Maryland policy responses include legislation and plans like the Greenhouse Gas Emissions Reduction Act implemented by the Maryland Department of the Environment and the Maryland Commission on Climate Change reports guiding mitigation and adaptation, with targets influenced by regional accords such as the Regional Greenhouse Gas Initiative. Localities including Baltimore City, Annapolis, Montgomery County, and Anne Arundel County have developed resilience plans that coordinate with the Federal Emergency Management Agency and the National Fish and Wildlife Foundation. Renewable energy and emissions reduction projects involve utilities such as Baltimore Gas and Electric and renewable developers partnering with universities like the University of Maryland, College Park and nonprofits like the Chesapeake Bay Foundation, while shoreline and marsh restoration projects are carried out by the Maryland Department of Natural Resources and the U.S. Fish and Wildlife Service to protect communities in Dorchester County and preserve ecosystems such as Blackwater National Wildlife Refuge.

Category:Environment of Maryland