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Global Warming and Coastal Dead Zones NATIONAL WETLANDS NEWSLETTER, vol. 30, no. 4. Copyright © 2008 Environmental Law Institute.® Washington D.C., USA. Reprinted by permission of the National Wetlands Newsletter. To subscribe, call 800-433-5120, write [email protected], or visit http://www.eli.org/nww. Global Warming and Coastal Dead Zones BY DONALD F. BOESCH Massive, low-oxygen “dead zones” unable to support marine life can be found in coastal waters worldwide. Excessive nutrients, primarily from chemical fertilizers, are mostly to blame. Absent immediate action, climate change will only exacerbate the problem. uring the latter part of the 20th century, many es- fresher, warmer surface water and saltier, cooler bottom water is re- tuaries, bays, continental shelves, and enclosed seas stricted. As the oxygen inventory of the bottom water is consumed, around the world experienced a significant reduc- it is not replenished fast enough, even though dissolved oxygen in tion of dissolved oxygen concentrations in bottom the surface waters may be supersaturated due to the very high rates Dwaters, creating what are commonly referred to as “dead zones.” of photosynthesis. These are sometimes vast areas where, at least during the warmer Dissolved oxygen concentrations plummet in bottom waters, part of the year, oxygen concentrations are too low to support fish, killing animals or requiring them to flee if they can. Sometimes crustaceans, and other animals. Eutrophication—the abundant fish kills result, but typically the lack of corpses belies the impact as accumulation of nutrients in an ecosystem—is often the cause of many fish, crustaceans, and shellfish are taken by predators as they these dead zones, termed hypoxia where concentrations of oxygen leave the relative safety of their bottom habitats. Biogeochemical fall below 2 mg/L, and anoxia where the presence of oxygen is changes enhance the return of nitrogen and phosphorus from the virtually nil. sediments to the water column, refueling the fire of primary pro- The Gulf of Mexico dead zone, extending west on the inner duction in a vicious cycle (Kemp et al., 2005). As a result, the Louisiana-Texas continental shelf from the mouth of the Missis- important ecosystem services these coastal environments provide sippi River, is perhaps the most famous. It has developed virtually are compromised. every summer since the early 1970s and can cover 22,000 km2 The more-or-less synchronous development of coastal dead (Rabalais et al., 2007). The deep hypoxic zone of the Baltic Sea zones around the world was closely linked with increased inputs is even larger and has become a year-round, multi-decade feature. of nitrogen and phosphorus from human activities, including ag- Seasonal dead zones are prominent in the Chesapeake Bay, Long riculture, waste discharges, atmospheric deposition of nitrogen Island Sound, many smaller U.S. bay estuaries, and in coastal envi- resulting from the combustion of fossil fuels, and runoff from ronments around the world, particularly in Europe and Asia. Some urbanizing areas (Boesch, 2002). In particular, the dramatic 169 of these hypoxic zones have been documented, and their num- growth in the use of industrially manufactured nitrogen fertil- bers are increasing (Selman et al., 2008). izer beginning in the 1960s, which provided a needed increase Although natural processes can cause and always contribute in food production, resulted in increased nutrient runoff from to the development of hypoxia and anoxia, most of these dead crop lands and intensified animal production and waste genera- zones have developed or been exacerbated by human activities, tion. Artificial drainage of heavily fertilized crop lands, such as in particularly the increase in loading of nutrients—nitrogen and the Mississippi River basin, and the loss of riparian wetlands also phosphorus in various forms—from land to the coastal waters. facilitated downstream nutrient discharges (Mitsch et al., 2001; Phytoplankton—microscopic plants that live in the water—pho- EPA Science Advisory Board, 2007). tosynthesize these excess nutrients through a process known as There are a number of large, concerted and expensive efforts primary production, creating new organic matter along the way. to reverse eutrophication in coastal waters, including commitments Some of the additional organic matter that is produced settles into to reduce nitrogen and phosphorus loadings by 50% or more in bottom waters where it decomposes and consumes oxygen in the the Baltic and North seas and the Chesapeake Bay (Boesch, 2002; process. Coastal waters prone to hypoxia are deep enough to ex- Kemp et al., 2005). An action plan to reduce the Gulf of Mexico perience density stratification, whereby the mixing between the dead zone by two-thirds has not yet adopted a numeric nutrient reduction goal, though a U.S. Environmental Protection Agency Science Advisory Board has recommended that nitrogen and phos- Dr. Donald Boesch is the President of the University of Maryland phorus loads be reduced by 45%. Depending on the sources within Center for Environmental Science. He was recently recognized for the relevant watershed, reduction of nutrient loads can involve ter- lifetime leadership in ecological restoration at the National Conference tiary treatment of municipal wastes (e.g., for Long Island Sound on Ecosystem Restoration. where these are the major sources), air pollution control to reduce July-August 2008 11 Table 1. The influence of multiple climate drivers on the extent and severity of coastal hypoxia (adapted from Boesch et al., 2007). Climate Driver Direct Effect Secondary Effect Hypoxia Increased temperature More evapotransportation Decreased streamflow - Land-use and cover changes +/- Less snow cover More nitrogen retention - Warmer coastal water Stronger stratification + temperature Higher metabolic rates + More precipitation More streamflow Stronger stratification + More nutrient loading + More extreme rainfall Greater erosion of soil P + Less precipitation Less streamflow Weaker stratification - Less nutrient loading - Higher sea level Greater depth/volume Stronger stratification + Greater bottom water volume - Less hydraulic mixing + Less tidal marsh Diminished nutrient trapping + Weaker summer wind Less water column mixing More persistent stratification + Stronger summer wind More water column mixing Less persistent stratification - atmospheric deposition of nitrogen, various agricultural manage- runoff in the Midwest and Northeast while decreasing it in the ment practices (e.g., in the Chesapeake and Mississippi basins already arid Southwest (Milly et al., 2005). In the Gulf of Mexico, where these sources are large), and restoration of nutrient-trapping a 20% increase in Mississippi-Atchafalaya River system discharges wetlands and riparian zones. will increase the flux of nitrate to the northern gulf and increase Recent reports have demonstrated that the longer a region density stratification on the inner shelf, thereby increasing the suffers from regularly recurrent hypoxia the more difficult it is to frequency and extent of hypoxia and requiring greater reductions restore oxygen conditions and bring the dead zones back to life be- of human nutrient sources to achieve the objectives of the action cause the sediments build up organic matter and nutrients (Conley plan (Justić et al., 2003). In the Chesapeake Bay, in addition to in- et al., 2007; Turner et al., 2008). These ecosystems have reached a creased winter-spring runoff and warming, accelerated sea-level rise recalcitrant, degraded state, and significant and sustained reduction will increase the volume of the bay and the penetration of ocean in nutrient loading may be required for them to cross back over the water, with complex effects on mixing and stratification (Boesch threshold of recovery (Kemp & Goldman, 2008). Because recovery et al., 2008). becomes increasingly more difficult, time is of the essence. Recent reports on how climate change may already be influ- It is likely that global warming will only exacerbate hypoxic encing oxygen availability in the ocean, unrelated to nutrient load- conditions. A degraded ecosystem suffering from eutrophication ing from human activities, underscores the sensitivity of ocean life has diminished resilience in its response to changing conditions. to this great 21st century challenge. Changes in wind patterns have Effects of global warming are already being observed on both land resulted in shifts in ocean currents and deep upwelling, causing and in the ocean and will intensify during this century (IPCC, hypoxia and mass mortalities in recent years along the inner shelf 2007). Multiple climatic drivers that influence the formation of off the Oregon and Washington coasts (Chan et al., 2008). Deep dead zones will be affected, including increased temperatures, oxygen minimum zones in tropical oceans have vertically expanded changes in the amount and timing of precipitation, sea level rise, over the last 50 years (Stramma et al., 2008). and changes in the frequency and intensity of winds and storms. Future projections and current warning signs of the effects These will interact in complex ways to exacerbate, or under some of global warming should provide a sense of urgency in our ef- conditions alleviate, hypoxia (see Table 1). forts to abate coastal eutrophication and resuscitate dead zones. In the Baltic Sea, for example, the projected increases in Healthy, resilient ecosystems will still be subject to change, but precipitation and runoff and sea surface temperature
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