Friday, November 18, 2022

Walt Speaks on Bay Health

Walter Boynton
 Southern Maryland News, Lab professor reflects on state of the Chesapeake Bay

Professor Emeritus Walter Boynton of the University of Maryland Center for Environmental Science Chesapeake Biological Laboratory spoke about the bay during a presentation titled “Chesapeake Reflections: What We’ve Learned During the Past 50 Years and Where We Need To Go in the Future” at the laboratory’s offices in Solomons.

“It’s a fascinating, responsive ecosystem,” Boynton said of the Chesapeake Bay, which is about 200 miles long and has more than 11,000 miles of shoreline. “It’s not a brontosaurus where you pushed on it and nothing happened [except that] it roared. It’s much more like a greyhound where responses can be quick.”

Boynton spoke about how change is a common theme in the Chesapeake Bay, related a bit of history, shared several stories of loss and how environmental science unravels causes and cures, ad climate change.
. . .
Boynton began his 45-minute talk by showing a 1588 painting that presented Indigenous people in a dugout canoe along with various forms of sea life in crystal clear water that also showed the bottom of the water column.

He also shared a quote from 1859’s “The Old Plantation” that reads, “So transparent are its waters that far out from shore you may see, in the openings of the weed forest, on its bottom the flashing sides of the finny tribe they glide over the pearly sands.”

“The water quality was bad in the 1970s and 1980s,” Perez said, “but it’s a little bit better. And there’s forward momentum.”

“I think we can get back to the days where the water is much clearer than it is now,” Boynton said.

I know Walt. Good guy, a real fixture in the community, and well liked. But how is the Bay really doing? Chesapeake Bay Program,  Experts find 2022 dead zone to be 10th smallest since 1985, "Cool temperatures and strong winds in September shortened duration."

The Chesapeake Bay dead zone—an area of low oxygen that forms in deep Bay waters when excess nutrients enter through polluted runoff and feed naturally-occurring algae—was the 10th smallest since 1985 according to experts from the Maryland Department of Natural Resources and the Virginia Institute of Marine Science.

“It is always welcome news to see improved Chesapeake Bay dissolved oxygen conditions that are so vital for the health of fish, crabs, oysters and other aquatic life,” remarked Mark Trice, water quality informatics program manager with the Maryland Department of Natural Resources.

Hypoxic, or low-oxygen, conditions form when nitrogen, phosphorus and sediment pollution enter waterways in greater amounts than the ecosystem can handle. It causes naturally-occurring algae to grow and bloom in large quantities and then die off. When the algae blooms decompose, they remove oxygen from the surrounding water faster than it can be replenished. It can suffocate the marine life that live in that region and cause others to seek new habitat.

Each year, the Maryland Department of Natural Resources and Old Dominion University conduct water quality monitoring cruises from May—October to measure the amount of hypoxia in the Bay. Results from these cruises can be found on Maryland’s Eyes on the Bay and Virginia’s VECOS websites, respectively.

In addition, the Virginia Institute of Marine Science and Anchor QEA use a sophisticated computer model, combined with local weather information, to estimate how much nitrogen and phosphorus enters the Bay from its surrounding watershed. This information produces daily, real-time estimates of the dead zone size throughout the summer. These forecasts, along with other daily estimates of environmental conditions throughout the Bay, are available to view on the Chesapeake Bay Environmental Forecast System.

Weather conditions are primarily responsible for dictating how large the annual dead zone will be, and how long it will last, into the fall. In June, experts predicted that the 2022 dead zone would be 13% smaller than those in the past, due to less winter and spring precipitation. Lower amounts of precipitation bring about smaller river flows, meaning lower amounts of nitrogen, phosphorus and sediment pollutants entering the Bay. The U.S. Geological Survey reported that the 2022 water year (measured from October 1, 2021—September 30, 2022) had river flows entering the Chesapeake at an average of 73,000 cubic feet per second, which is below the long-term average of 79,000 cubic feet per second.

Hypoxia appeared later than normal this year—in June—due to cool and windy conditions in the spring. The dead zone was more typical in size until mid-August due to moderate river flows, temperatures and winds throughout the region. It was still observed in mid-September, but cooler temperatures and stronger winds in the early fall caused it to disappear soon after. In fact, the Virginia Institute of Marine Science model found that the 2022 dead zone duration was likely 95% shorter than any since 1985.

Tenth best of of 37 years? If the $25 billion (with a "B") we've spent on the Bay in the since 1985 (the year we arrived in Maryland) were doing much good we'd be entitled to hope for more progress than that.

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