Network for measuring greenhouse gases in the atmosphere
Methods and apparatuses, including computer program products, are described for measuring greenhouse gas. A calibration device receives a first sample of atmospheric gas from a first port exposed to the earth's atmosphere. The calibration device receives a second sample of atmospheric gas from a second port exposed to the earth's atmosphere. The calibration device routes the first sample and the second sample to a measurement device for greenhouse gas analysis. The measurement device determines a characteristic of a greenhouse gas present in at least one of the first sample and the second sample. The measurement device transmits data associated with the determined characteristic of the greenhouse gas to a computing device for determining sinks and sources of the gas.
1. A device for calibrating a greenhouse gas measurement device, the device comprising:
a plurality of inlets for receiving samples of atmospheric gas from a plurality of ports exposed to the earth's atmosphere, wherein each of the one or more ports is positioned at a different level of the atmosphere; one or more pumps for regulating a flow of the atmospheric gas received via the inlets; one or more calibration tanks; a sampling module comprising:
a valve coupled to the one or more pumps and the one or more calibration tanks, a pressure and temperature controller, and a dryer;
the sampling module configured to:
sample gas of each of the plurality of ports from one or more of the pumps using the valve;
regulate pressure and temperature of the sampled gas of each of the plurality of ports using the pressure and temperature controller; remove water vapor from the sampled gas of each of the plurality of ports using the dryer; and
convey the sampled gas of each of the plurality of ports from the dryer to a measurement device;
sample gas from at least one of the one or more calibration tanks using the valve;
convey the sampled gas of at least one of the one or more calibration tanks to the measurement device; the measurement device comprising: a processor; a memory module; and
an internal measurement sensor; the measurement device configured to:
determine a characteristic of a greenhouse gas present in the sampled gas of the at least one of the one or more calibration tanks using the internal measurement sensor;
compare the determined characteristic of the greenhouse gas present in the sampled gas of the at least one of the one or more calibration tanks to an expected value for the determined characteristic;
adjust the measurement device for subsequent greenhouse gas analysis when the determined characteristic of the greenhouse gas present in the sampled gas of the at least one of the one or more calibration tanks is different than the expected value for the determined characteristic;
determine a characteristic of a greenhouse gas present in a first sample of gas from one of the plurality of ports at a first level of the atmosphere using the internal measurement sensor;
determine a characteristic of a greenhouse gas present in a second sample of gas from another of the plurality of ports at a second level of the atmosphere using the internal measurement sensor;
record, at the memory module, parameters of the measurement device during the steps of determining the characteristic of the greenhouse gas present in the first sample of gas and determining the characteristic of the greenhouse gas present in the second sample of gas; and
adjust the measurement device for subsequent greenhouse gas analysis based upon the recorded parameters.
2. The device of claim 1 , wherein the sampling module is further configured to:
measure the pressure of the sampled gas of the at least one of the one or more calibration tanks; and
transmit the measured pressure value to the measurement device.
3. The device of claim 1 , further comprising a sampling controller coupled to the valve configured to instruct the valve to sample gas from one of the one or more pumps or one of the one or more calibration tanks.
4. The device of claim 3 , wherein the sampling controller instructs the valve to sample gas from the one or more pumps and the one or more calibration tanks in a predetermined sequence.
5. The device of claim 1 , wherein the inlets are coupled to the ports via a tube.
6. The device of claim 1 , wherein the atmospheric gas received by j least one of the plurality inlets is air.
7. The device of claim 1 , wherein at least one of the one or more calibration tanks contains a gas used for zeroing the calibration device.
8. The device of claim 1 , wherein the valve is further coupled to an auxiliary intake configured to access an additional gas source.
9. The device of claim 1 , wherein the sampling device is further configured to:
receive quality control data from the calibration device; and
adjust the sampling of gas based on the quality control data.