The eosGP is a compact, waterproof carbon dioxide (CO2) concentration probe for continuous, accurate, monitoring in harsh soil and aquatic environments, and can withstand taking measurements during anything from searing summers to freezing winters.
eosGP gas probes are used to collect carbon dioxide (CO2) concentration measurements for research into challenges including carbon sequestration in soil, rivers, and lakes.
eosGP CO2 Concentration Probe Highlights
Lower power requirements, out-of-the-box submersibility, small size, and compatibility with standard dataloggers make the eosGP a handy addition for your field kit for both soil and water based measurements.
Continuous In-Situ Concentration Measurements
This is a hard-working device—its continuous data stream lets you capture gas concentration patterns, trends, and variability in soil and water.
The eosGP’s broad operating temperature range (0 C to 40 C / 32 F to 104 F) and built-in temperature correction means you can use this probe in most climates. Its strong, waterproof housing allows long-term soil and fresh water deployments to depths of 3 m / 10 ft.
Compact and Low Energy
Small and light—fitting easily into your hand—this device can make carbon dioxide (CO2) concentration measurements anywhere. Its peak power consumption of less than 1 W can easily be handled by, for example, a modest solar panel. The device produces very little heat, so it has minimal thermal effect on the soil environment.
Integration and Compatibility
The eosGP likely connects conveniently with your current field infrastructure. Its standard 0 V to 5 V analog outputs are compatible with most dataloggers. The eosGP can be powered by commonly available 5 V DC to 24 V DC sources, just like your other equipment.
· 5 available concentration calibration options
· Waterproof to 3 m / 10 ft
· Low power consumption (< 1 W)
· Quick equilibrium (< 90 s in air)
· Logging and visualization software
· Compatible with leading data loggers
· Ambient Temperature: 0 C to 40 C / 32 F to 104 F
· Ambient Humidity: 100% RH, non-condensing
· Power: 5 V DC to 24 V DC (12 V DC recommended), < 1 W
· CO1% range + 1% reading Concentration Accuracy:
· Typical measurement response (T90): < 90 s
· Output: 0 V to 5 V (Analog), digital (RS232)
· Weight: 210 g / 0.46 lb
· Dimensions (Ø x L) : 5.1 cm x 10.7 cm / 2 in x 4.2 in
UNDERSTANDING CLIMATE CHANGE
Climate change is one of the most important issues in the world, today and into the future. Carbon dioxide (CO) is one of the most abundant greenhouse gases (GHG) in our atmosphere, making it an essential gas to understand. Eosense’s waterproof CO probes are helping to answer climate change and mitigation questions by assisting the Baldocchi Lab at UC Berkeley in gathering the necessary data for their studies on the carbon dynamics of the Sacramento-San Joaquin Delta (SSJD). While their work is ongoing, interesting insights into the carbon dynamics of the SSJD have already been brought to light.
The SSJD is crucial because:
With a better understanding of how current agricultural activity and restoration projects are influencing GHG fluxes, the goal of the Baldocchi Lab is to uncover an optimal balance between the SSJD’s uses.
THE BIG PICTURE
Climate change is a recognized problem that has already impacted many places in the world, and for the State of California it has exacerbated severe multi-year droughts. During the 1800’s the land in the SSJD was converted from a wetland ecosystem into agricultural land, largely to provide fresh fruit to mine workers during the California Gold Rush. Today the SSJD is still used as economically important agricultural land, is a source for irrigation water that supplies more than 1 million acres of farmland, and provides drinking water to more than half of the population in the State of California (20 million).
The delta’s proximity to the ocean and artificially low elevation (-10 m / -30 ft), caused by agriculture-induced subsidence, makes it vulnerable to sea level rise. The combination of land subsidence and severe drought ultimately compromises both an important water source and the economically important agricultural land.
Restoring the land in the SSJD back to its original wetland state will help build up soils, making them less vulnerable to inundation by saltwater, thereby protecting the delta’s water supply. However, while restoring agricultural land back into wetland increases carbon sequestration, it also reduces the economic potential of the land and has the potential to release methane (CH), which has 25 to 30 times the global-warming potential of CO . Understanding how and where carbon is stored and how much is emitted by different land-use types in the SSJD will ultimately determine the balance between wetland restoration and continued agricultural use. This information will also allow for potential carbon sequestration opportunities and the development of a carbon credit system for the State of California.
THE RESEARCH OBJECTIVES
The Baldocchi Lab at UC Berkeley has been studying the SSJD for eight years, and will continue to do so for at least another five years. The main questions they want answered are: What are the current CO and CH fluxes of the drained peatlands? How will changing the land type from drained peatlands to flooded wetland or rice paddies change these fluxes over time? Can a viable protocol be set up using the data from the project to implement a carbon offset program in the State of California with current and future restorative projects?
WHERE EOSENSE COMES IN…
The Baldocchi Lab needed to explain patterns they have been seeing in their eddy covariance flux data and chose the eosGP CO probes because of their waterproofness, low cost, and low power requirements. Powered by solar panels alone, the continuous data captured by the CO probes, installed in both water and soil, allowed for both short- and long-term insights. The probes have shed light on how water column thermal turnover affects CO emissions from the wetland, as well as revealed more about the subsurface CO dynamics of the alfalfa fields in the SSJD. Lastly, it was noted by the Baldocchi team that the probes do not artificially heat the soil as much as other probes, minimizing a potential source for biased results.
“The eosGP probes are great for measuring CO in wet environments – they can be buried directly in soil or used underwater without additional waterproofing. This one-piece sensor has a simple cable interface offering digital and analog outputs and has power requirements suitable for solar power. — Joe Verfaillie (Lab Manager, Baldocchi Lab)”
FINDINGS SO FAR
So far the study has shown that the oldest of the restored wetland sites appears to be sequestering less carbon than it did in when it was newly restored. One possible explanation for this is that the detrital layers have become thick enough that new growth is taking longer to get through. Since new growth typically stores more carbon, the attenuated growth may explain the unexpected decrease in sequestration observed.
The next revelation was the sharp decrease in soil CO levels in the alfalfa fields after mowing took place (Figure 1). This is likely due to the removal of the photosynthetic surface of the plants resulting in a decrease in photosynthesis, and consequently a decrease in root exudates. These exudates are metabolized by bacterial communities in the soil, which in turn respire it as CO .
PLANNING FOR THE FUTURE
The Baldocchi Lab is undertaking this large project with the aim of establishing a baseline of GHG fluxes in the Sacramento-San Joaquin Delta in its current state, which is both agricultural land and restored wetland. Studying the different land-use types and understanding current GHG dynamics will help inform future management strategies on how best to move forward with restoration projects. The findings of the Baldocchi lab will also assist the state of California in assessing the potential for a carbon credit system.
Learn more about the Baldocchi Lab’s work at UC Berkeley website: