3.9.4. LI840¶
3.9.4.1. Introduction¶
Li-Cor LI-840 infrared gas analyser. It uses an interchangeable optical path so can take simultaneous measurements from multiple locations.
3.9.4.2. Manufacturer and Model¶
Model |
Brand |
Type |
|---|---|---|
Li840-1 |
Li-Cor |
Gas Analyser |
3.9.4.3. Output definitions¶
Ouput definition ID |
File Identifier |
Level Number |
QAQC notes |
File time resolution |
|---|---|---|---|---|
Li840 |
Li840-%LETTER_%SITE |
0 |
2Hz |
|
Li840 |
Li840-%LETTER_%SITE |
0 |
1min |
3.9.4.4. Variables measured by instrument¶
Variable ID |
Full Name |
Unit |
Lower Threshold |
Upper Threshold |
Files present (Output definition ID,Level No,Time resolution) |
|---|---|---|---|---|---|
C_CO2_ppm |
carbon_dioxide_concentration |
ppm |
Li840,0,2Hz Li840,0,1min |
||
C_H20_ppt |
water_vapour_concentration |
ppt |
Li840,0,2Hz Li840,0,1min |
||
Cellpress |
LiCor_cell_pressure |
hPa |
Li840,0,2Hz Li840,0,1min |
||
CellT |
LiCor_cell_temperature |
Celsius |
Li840,0,2Hz Li840,0,1min |
||
CO2_abs |
carbon_dioxide_absorption_Li840 |
ppm |
Li840,0,2Hz Li840,0,1min |
||
CO2_raw |
raw_carbon_dioxide_concentration |
ppm |
Li840,0,2Hz Li840,0,1min |
||
CO2_ref |
ref_carbon_dioxide_concentration |
ppm |
Li840,0,2Hz Li840,0,1min |
||
H20_abs |
water_absorption_Li840 |
ppt |
Li840,0,2Hz Li840,0,1min |
||
H20_raw |
raw_water_vapour_concentration |
ppt |
Li840,0,2Hz Li840,0,1min |
||
H20_ref |
ref_water_vapour_concentration |
ppt |
Li840,0,2Hz Li840,0,1min |
||
iVolt |
input_voltage |
microvolt |
Li840,0,2Hz Li840,0,1min |
||
num_points |
number_of_points_in_average_value |
N/A |
Li840,0,2Hz Li840,0,1min |
||
Tdew |
dewpoint_temperature |
Celsius |
Li840,0,2Hz Li840,0,1min |
||
valveid |
valve_identification |
N/A |
Li840,0,2Hz Li840,0,1min |
3.9.4.5. Serials¶
Serial |
Suffix |
|---|---|
A |
|
B |
3.9.4.6. Deployments¶
3.9.4.6.1. Serial number: HGA-0418¶
Site ID |
Start date |
End date |
|---|---|---|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2011-09-25 00:00 |
2012-03-25 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
|
2013-02-25 00:00 |
2013-05-07 00:00 |
3.9.4.6.2. Serial number: HGA-0416¶
Site ID |
Start date |
End date |
|---|---|---|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2010-01-25 00:00 |
2011-09-04 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
|
2012-04-11 00:00 |
2013-02-25 00:00 |
3.9.4.7. Photos¶
Fig. 3.19 Measurements taken at intervals down the face of the building at KSNW 17/12/2015.¶
3.9.4.8. Supplementary information¶
Link |
Title |
Description |
|---|---|---|
LI840 manual |
Manual from Li-Cor. |
3.9.4.9. Data acquisition¶
Data can be requested from Prof. Sue Grimmond (c.s.grimmond@reading.ac.uk).
3.9.4.10. References¶
Bjorkegren, A. and Grimmond, C. S. B., (2017) Net carbon dioxide emissions from central London. Urban Climate, 23. pp. 131-158. ISSN 2212-0955 doi: https://doi.org/10.1016/j.uclim.2016.10.002
Bjorkeren, A. B., Grimmond, C. S. B., Kotthaus, S. and Malamud, B. D. (2015) CO2 emission estimation in the urban environment: measurement of the CO2 storage term. Atmospheric Environment, 122. pp. 775-790. ISSN 1352-2310 doi: https://doi.org/10.1016/j.atmosenv.2015.10.012
Kotthaus, S. and Grimmond, C. S. B. (2012) Identification of micro-scale anthropogenic CO2, heat and moisture sources – processing eddy covariance fluxes for a dense urban environment. Atmospheric Environment, 57. pp. 301-316. ISSN 1352-2310 doi: https://doi.org/10.1016/j.atmosenv.2012.04.024
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