Here at beyondthebayblog, we’ve switched some of our focus to environment and energy issues in the region. Gary has been looking into the regional utility system, and examining some of the challenges associated with switching to more renewable energy. Specifically, he’s tackling the issue of net metering.
As property owners in Virginia decide to install and utilize small-scale solar panels while remaining connected to the grid, they must participate in net metering. The grid stores excess solar power generated by a consumer, and allows the consumer to buy electricity from the grid when they either can’t generate enough solar power, or are unable to generate any solar (such as at nighttime). Without storage solutions (reliable batteries are still very expensive), and without living entirely off-grid, consumers with solar power must participate in net metering. As you can guess, net metering tends to favor the consumer with solar, as his or her electricity bills generally decline in monthly cost. Utility companies tend to view this as a threat, and as such, certain companies such as Dominion Energy here in Virginia, place a cap on how much solar can be generated within the state. (Rooftop solar is currently capped at 1% of Dominion’s generating capacity). Gary has gone a little more in-depth, to examine the pros and cons of net metering, in his document “Bottom-line on Net Metering.” Please take a look. netMeteringDefense=v2
In June, Virginia’s Governor McAuliffe pledged to uphold the Paris Climate Agreement goals, agreeing to honor the state’s commitment to greenhouse gas reductions of 26-28% of 2005 levels by 2025. Since this time, I’ve been looking into how the state and its counties have addressed climate change mitigation in the past, and I have been researching ways in which we can move forward on 2025 goals. Much remains to be done at the state level, but I wanted to focus on Fairfax County for the time being. Fairfax is the county in which I reside. It is also the most populous county in Virginia. Action taken here to curb greenhouse gas emissions would go a long way in helping the state achieve its 2025 goals.
I started with searching for a greenhouse gas emissions inventory for the county, and found a report that spanned 2006-2010. Borrowing methods from the county inventory, I did a basic update for 2010 to 2015, looking at vehicles and stationary sources (consumption of electricity and natural gas). This inventory as of now does not go as in-depth as the 2010 county report, but it shows the biggest sectors contributing to greenhouse gas emissions in Fairfax.
I am including a chart below, which shows annual emissions from 2005 to 2010 (all emissions have been converted to metric tons of carbon dioxide equivalent or CO2e). Emissions from certain sectors have remained consistently high – vehicles, for instance, while others have fallen. Emissions from electricity consumption have significantly dropped over the past decade, contributing to the overall drop in greenhouse gases emitted from Fairfax County. This is likely due to the shift from coal-fired to natural gas fired power plants that took place over this time frame. Burning natural gas does not produce as much carbon dioxide as burning coal. Technology leading to “cleaner” burning coal may have helped as well. Despite this drop in emissions, over the past couple of years, progress has stalled. Fairfax County is about halfway to its 2025 goals, but the county has a long way to go, in terms of evaluating where new regulations should be put into place, and what changes can be made.
In addition to the individual emission sources, I have charted total emissions against the 2025 goal to demonstrate how much further emissions need to drop for the county to meet reductions pledged in the Paris Climate Agreement. I am finishing up a first draft of a report, and will share the inventory with the blog in the near future. Stay tuned!
Researchers at the University of Maryland’s Center for Environmental Science (UMCES) are trying to keep track of dolphin sightings in the Chesapeake Bay. Both WTOP and the Star Democrat recently reported on the increases in dolphin sightings in the Bay over the summer months in recent years. UMCES now has an interactive map, which a user can add his or her own sightings to. After registering, users can click a location on the map, add the time and date of the sighting, and how many dolphins were spotted.
Funnily enough, I read both of these articles this morning, after spotting a dolphin in Antipoison Creek yesterday morning (7/5). I’ve gone ahead and added my own sighting to the map. Please do the same if you have seen any dolphins in the Bay or one of its tributaries. Doing so allows UMCES researchers to get a better idea of where dolphins are travelling, how often, and why sightings have increased in recent years. You can check out or add to the map here.
Each year the Maryland Department of Natural Resources, in partnership with UMCES and VIMS, conducts a winter dredge survey to estimate blue crab population numbers in the Chesapeake Bay. The survey gathers information on the total number of crabs, as well as the number of adult males, female crabs of spawning age, and juveniles. Total numbers give an indication of the current health of the blue crab population; the number of juvenile and female crabs of spawning age give an indication of future conditions. Spawning age females impact the beginning of the coming harvest season (April to July, now ongoing); juvenile crabs impact the harvest further down the line.
The 2017 survey brought mixed results. Total population decreased in number from last year’s 553 million count to 455 million.
Population numbers of spawning age females must meet a certain threshold to be considered sustainable (70 million). Virginia and Maryland have also adopted a population target of 215 million. This year’s count of females of spawning age was the highest since the survey was first undertaken in 1988, with a number of 254 million, well above the target number. This number increased from last year’s count of 194 million.
Survey results were not so good for adult males – which decreased by 16% – nor for juveniles. The number of juvenile crabs estimated in this year’s dredge survey was the fourth lowest number ever recorded. This decrease could impact the second half of this year’s harvest (Maryland’s crabbing season runs until December 15; Virginia’s season closes November 30). Scientists on the Chesapeake Bay Stock Assessment Committee are likely to release updated management recommendations to Maryland and Virginia later this summer.
Note: To read more about where the winter dredge survey takes place, and how the survey is conducted, please read this piece from Maryland’s Department of Natural Resources.
Ted Williams wrote a piece this week for Yale Environment 360 on the impact climate change is having on the Delaware Bay. Although this estuary is much smaller than the Chesapeake Bay (782 square miles to the Chesapeake’s 64,299 square miles), the two watersheds have a lot in common, in terms of geographic location, features, and marine and shorebird species. The changes Williams sees occurring in Delaware Bay are either issues we are currently seeing in the Chesapeake, or could be a sign of changes to come.
The most dramatic change occurring in the Delaware Bay is the loss of tidal wetlands due to sea level rise and erosion. The watershed is losing an acre a day of its wetlands. With rate loss expected to increase, by 2100, 90% of these wetlands may be lost.
Wetland loss impacts lifecycle processes of several species. Atlantic menhaden larvae require tidal marshes. Ribbed mussels (an important filter feeder in the Bay) form tight-knit clusters in marshes; erosion makes the mussels more susceptible to predation.
Sea level rise contributes to beach erosion and shoreline tree loss. Horseshoe crabs, which use beaches in the Delaware Bay watershed as spawning grounds, are losing their grounds to sea level rise. Some shorebird species dependent on horseshoe crab eggs, such as the red knot, are at risk from these environmental changes.
Certain species in the Delaware Bay may see short-term benefits from climate change. With fewer freezes occurring, Delaware Bay oysters can survive in intertidal zones. However these now warmer zones are hosts to diseases (MSX and Dermo) and predators (oyster drills).
Warmer waters exacerbate pollution issues. Nutrients build up, dissolved oxygen can decrease, and algal blooms can increase in frequency.
The Chesapeake Bay is also experiencing shoreline loss and erosion. Places like Dameron Marsh and Hughlett Point in Virginia have been discussed here previously in terms of erosion and sea level rise. Naturally warmer waters in the Bay mean that diseases such as MSX and Dermo have been impacting native oysters for decades. It will be interesting to see how warmer waters -associated with climate change- host new or increased populations of pests/predators for our oysters. Ocean acidification may also be a concern. The changes occurring between species relationships, such as between Delaware’s red knot and horseshoe crab, will certainly be something to look out for in this watershed.
To read Ted Williams’ article, please visit e360.yale.edu.
If you remember, last December G2 sent in water samples from Antipoison Creek to Abby Barrows at Adventure Scientists (see this former post). Abby has been documenting the presence of microplastics in global waters. Microplastics are bits of microscopic plastic debris. A major source of this debris is clothing. As synthetic fibers (many clothing items such as fleeces are made with synthetic fibers) are put through the washing machine, plastic debris from these items come out of homes as wastewater, and eventually make their way to streams, rivers and oceans. Preliminary evidence suggests that marine species are reacting negatively to the ingestion of microplastics. The team at Adventure Scientists has been accepting water samples from around the globe to determine how prevalent pollution from microplastics is. You can check out their online map to see which waters have not been sampled yet, and sign up to sample if you see an opportunity to contribute.
G2 received results from the Antipoison Creek samples. One blue microfiber was found from our samples. The results were shared via the Adventure Scientists blog here, which also includes a post on Abby’s lab process and overall project results thus far. Go check it out!
The University of Maryland’s Center for Environmental Science (UMCES) has issued their annual report card on the health of the Chesapeake Bay watershed for 2016. This report examines several factors, including water quality, fisheries, and vegetative growth. Contributing factors are examined individually and the Bay is given an overall score based on these factors. This year, UMCES awarded the Bay watershed a C grade for the 2016-reporting year. While the letter grade remains unchanged from former years (going back to 2012), Bay health has improved by 1% since 2015- up to 54%.
This year’s online report is somewhat more interactive than in previous years, and includes some great graphics and graphs comparing Bay health indicators over time. I encourage readers to check out the report themselves here, however, to sum up these individual indicators:
- Overall health improved in certain segments of the Bay, most noticeably in the Lower Bay (adjacent to Virginia’s Middle Peninsula and Virginia Peninsula on the Western shore).
- Dissolved oxygen levels remained at relatively good levels throughout 2016. Dissolved oxygen levels are a major concern in the mainstem of the Bay during the summer months, when water temperatures rise, water is still/stagnant reducing the mixing of fresh and saltwater, and nutrient pollution contributes to algal blooms. These factors reduce oxygen levels needed by marine species.
- Total nitrogen decreased slightly from 2015. The best results were seen in the Lower Bay (which scored highest for overall health), and in the James and Rappahannock Rivers (which feed directly into the Lower Bay). Total nitrogen levels were highest in portions of the Bay adjacent to the Lower Eastern Shore and in the Upper Bay. Higher nutrient levels seem to correlate with the location of big agricultural regions. Agricultural runoff from poultry farms on the Eastern Shore and from the ag-rich northern reaches of the watershed in Pennsylvania and Maryland are likely major contributors to these higher nitrogen levels. The Potomac River also scored poorly for total nitrogen, likely due to a mix of agricultural runoff and urban/stormwater runoff.
- Total phosphorus levels were good overall. The mainstem of the Bay scored the highest, while certain tributaries -the James and York Rivers – had poor scores.
- Chlorophyll a levels were poor throughout the Bay, scoring a D in all but the Upper Bay and Lower Eastern Shore (C), and the James River (B). UMCES attributes high chlorophyll a levels to elevated nutrient availability.
- Water clarity overall was poor or very poor throughout the Bay. The only exception was the highest rated Middle Bay, which received a C score.
- Aquatic grass abundance continues to be an issue in the Bay. Overall, acreage of submerged aquatic vegetation has steadily declined since the mid-to-late twentieth century. Certain areas have seen improvements since 2012. The Rappahannock River, Lower Eastern Shore and Upper Bay scored the highest for aquatic grasses, with a B grade. I cannot comment on the other portions of the Bay, but the Rappahannock River ranking is consistent with what we have been observing where we take water samples – in Virginia’s Antipoison Creek and Little Bay – where we saw Bay grasses return last spring. These grass beds show signs of returning this year.
- The benthic community refers to bottom-dwelling and filter-feeding organisms. In the Chesapeake Bay, the benthic community includes (but is not limited to) bacteria, worms, clams and oysters. I believe the oysters scored in this report refer only to native oyster populations. Overall, the benthic community had a decreased score from the previous two years. All but the Lower Eastern Shore (B) and the Lower Bay (A) scored low. The Middle Bay and Potomac River had very poor scores. The benthic community is impacted by nutrient, sediment and dissolved oxygen levels. The community fared best where both total nitrogen and dissolved oxygen levels also scored well (the Lower Bay).
- Blue crabs scored very well throughout the Bay (A), relating back to 2016 survey results.
- Bay anchovy and striped bass also scored an A throughout the entire Bay. Conditions for these indicators have been consistent since 2012.
Conditions in the Lower Bay are consistent with what we have been seeing at Antiposion Creek (at the very tip of the Northern Neck where the Rapphannock River meets the Bay; the Rapphannock River is the dividing line between the Northern Neck and Virginia’s Middle Peninsula)- aquatic grasses are returning; the crab population was abundant last summer, according to local watermen; our nutrient levels coming back in our sample analysis show a generally healthy watershed.
Agriculture is still a major land use in the Lower Bay watershed. However, it would be interesting to study how land use in the Lower Bay has changed from agricultural or commercial waterfront operations to residential, compared to the agricultural areas in the Upper Bay and Eastern Shore, where overall health was poorer. Perhaps this land use change, if the difference is significant enough between the Upper and Lower Bay watershed, is influencing health indicators. The Lower Bay has also seen an influx of commercial and recreational oyster production in its waters (something that has not been adopted to the same extent in Maryland). This too is likely impacting nutrient levels in the Lower Bay.