Solar Radiation Effects on Partial Pressure of Carbon Dioxide in Shallow Lakes
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1 LAWATER 218: 12TH ANNUAL LOUISIANA WATER CONFERENCE Solar Radiation Effects on Partial Pressure of Carbon Dioxide in Shallow Lakes Rongjie Yang, Y. Jun Xu*, Zhen Xu & Shiliang Liu School of Renewable Natural Resources Louisiana State University Agricultral Center Baton Rouge, LA, United States, March 27-28, 218
2 background Many freshwater systems are supersaturated with dissolved carbon dioxide (CO 2 ). These systems can act as a source of CO 2 to the atmosphere, which plays an important role in the global carbon cycle. Martin Kastowski. Institut für Geophysik und Geologie der Universität Leipzig. Simplified model of the main relevant carbon fluxes within a lake. 2
3 background Although previous studies have reported the effect of CO 2 partial pressure (pco 2 ) in a water body on CO 2 outgassing, it is not well known how pco 2 fluctuates daily and how this fluctuation could affect the outgassing process. pco 2? Hanson et al., 24, Global Change Biology. (6) The CO 2 partial pressure gradient between the lake and the atmosphere drives net atmospheric flux of DIC. A simplified diagram of carbon cycling through a landscape with one lake. 3
4 background Several previous studies have shown that changes in the dissolved carbon (mainly in DIC, DOC and CDOM) are highly affected by ambient conditions such solar radiation, which are one of the most key energy factors that affect the CO 2 fluxes of freshwater systems. However, limited information regarding the exact mechanisms of solar radiation affecting the pco 2 in water body. 4
5 background This is especially true for urban lakes, which often receive excess organic pollutants and nutrients from the developed surroundings, and which could be photo-chemically more active during daylight change. Little is known regarding the effects of solar radiation on pco 2 in urban shallow lakes. University Lake at Baton Rouge, LA Capitol Lake at Baton Rouge, LA 5
6 Objectives Estimate the pco 2 and related parameters in two shallow lakes with different trophic states at Baton Rouge, and compare their difference of carbon processing. Determine how solar radiation correlates with the levels of pco 2 and the interrelationship between pco 2 levels and other physical characteristics in the two urban lakes. 6
7 methods Investigation sites in our study Capitol Lake (CL) Latitude: 3 o 27 4 N, Longitude: 91 o 11 3 W University Lake (UL) Latitude 3 o 24 5 N; longitude 91 o 1 W 7
8 methods Detection parameters Partial pressure of carbon dioxide (pco 2, uatm) Dissolved inorganic carbon (DIC, μg C/mL) Dissolved organic carbon (DOC, ppm) Colored dissolved organic matter (CDOM, ppb) Dissolved oxygen (DO, ppm) Chlorophyll a fluorescence (Chl a, AFU) Specific conductance (SpCond, μs/cm) Water temperature and ph value Ammonium (NTU) 8
9 Solar rad value/sr Solar rad value/sr findings Solar radiation.35.3 UL-SR-Daily : 1: 2: 3: 4: 5: 6: 7: 8: 9:1:11:12:13:14:15:16:17:18:19:2:21:22:23:: 11/6/217 11/27/217 12/24/217 1/4/218 1/29/218 2/19/218 2/27/ CL-SR-Daily : 1: 2: 3: 4: 5: 6: 7: 8: 9:1:11:12:13:14:15:16:17:18:19:2:21:22:23:: 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 2/18/218 2/28/218 9
10 Partial pressure of carbon dioxide (pco 2 ; uatm) Partial pressure of carbon dioxide (pco 2 ; uatm) Partial pressure of carbon dioxide (pco 2 ; uatm) Partial pressure of carbon dioxide (pco 2 ; uatm) findings Partial pressure of carbon dioxide (pco2) 25 UL Daily pco 2 25 UL Monthly pco : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/6/217 11/27/217 12/24/217 1/4/218 1/29/218 2/19/218 2/27/ : 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 25 CL Daily pco 2 25 CL Monthly pco : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 2/18/218 2/28/218 6: 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 1
11 Partial pressure of carbon dioxide (pco 2 ; uatm) Partial pressure of carbon dioxide (pco 2 ; uatm) Partial pressure of carbon dioxide (pco 2 ; uatm) Partial pressure of carbon dioxide (pco 2 ; uatm) findings Compare pco 2 between UL and CL in each month 25 UL-Nov. CPL-Nov. 25 UL-Dec. CPL-Dec :: AM 1:: AM 1:: PM 4:: PM UL-Jan. CPL-Jan. 25 7:: AM 1:: AM 1:: PM 4:: PM UL-Feb. CPL-Feb :: AM 1:: AM 1:: PM 4:: PM 7:: AM 1:: AM 1:: PM 4:: PM 11
12 findings Pearson correlation analysis-university Lake SR pco 2 DO CDOM AMM FLU TBT SpCond Temp ph SR * pco * DO **.494**.521** **.153 CDOM **.91**.427* AMM 1..92**.423* FLU *.446* TBT SpCond Temp 1..55** ph 1. SR, Solar Radiation; DO, Dissolved oxygen; CDOM, Colored dissolved organic matter; AMM, Ammonium; FLU, Chlorophyll a fluorescence; TBT, Turbidity; Spcond, Specific conductance; Temp, Water temperature. *, P<.5; **, P<.1 according to the SPSS software analysis. 12
13 findings Pearson correlation analysis-capitol Lake SR pco 2 DO CDOM AMM FLU TBT SpCond Temp ph SR * pco **.533**.647** * DO **.428* CDOM **.718** AMM FLU * * TBT SpCond Temp 1..8 ph 1. SR, Solar radiation; DO, Dissolved oxygen; CDOM, Colored dissolved organic matter; AMM, Ammonium; FLU, Chlorophyll a fluorescence; TBT, Turbidity; Spcond, Specific conductance; Temp, Water temperature. *, P<.5; **, P<.1 according to the SPSS software analysis. 13
14 DO concentration (ppm) DO concentration (ppm) DO concentration (ppm) DO concentration (ppm) findings Dissolved oxygen (DO) 15 UL-Daily DO 15 UL-Monthly DO : 7: 8: 9: 1: 11: 12: 13: 14: 15: 16: 17: 18: 11/6/217 11/27/217 12/24/217 1/4/218 1/29/218 2/19/218 2/27/218 6: 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 15 CL-Daily DO 15 CL-Monthly DO : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 6: 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 2/18/218 2/28/218 Nov. Dec. Jan. Feb. 14
15 Colored dissolved organic matter (CDOM, ppb) Colored dissolved organic matter (CDOM, ppb) Colored dissolved organic matter (CDOM, ppb) Colored dissolved organic matter (CDOM, ppb) findings Colored dissolved organic matter (CDOM) 1 UL-Daily CDOM 1 UL-Monthly CDOM : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/6/217 11/27/217 12/24/217 1/4/218 1/29/218 2/19/218 2/27/218 1 CL-Daily CDOM 4 6: 7: 8: 9:1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 1 CL-Monthly CDOM : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 2/18/218 2/28/ : 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 15
16 Fluorescence (AFU) Fluorescence (AFU) Fluorescence (AFU) Fluorescence (AFU) findings Chlorophyll a fluorescence (Chl a) 12 UL-Daily Fluorescence 12 UL-Monthly Fluorescence : 7: 8: 9: 1: 11: 12: 13: 14: 15: 16: 17: 18: 11/6/217 11/27/217 12/24/217 1/4/218 1/29/218 2/19/218 2/27/218 6: 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 12 CL-Daily Fluorescence 12 CL-Monthly Fluorescence : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 2/18/218 2/28/ : 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 16
17 ph value ph value ph value ph value findings ph value 9 UL-Daily ph 9 UL-Monthly ph : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/6/217 11/27/217 12/24/217 1/4/218 1/29/218 2/19/218 2/27/218 9 CL-Daily ph 5 6: 7: 8: 9: 1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 9 CL-Monthly ph : 7: 8: 9: 1:11:12:13:14:15:16:17:18: 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 2/18/218 2/28/ : 7: 8: 9:1:11:12:13:14:15:16:17:18: Nov. Dec. Jan. Feb. 17
18 DIC concentration (μg C/mL) DOC concentration (ppm) DIC concentration (μg C/mL) DOC concentration (ppm) findings Dissolved inorganic/organic carbon (DIC, DOC) 2 UL-DIC UL-DOC /6/217 11/27/217 12/24/217 1/4/218 1/29/218 11/6/217 11/27/217 12/24/217 1/4/218 1/29/ CL-DIC 2 16 CL-DOC /7/217 11/26/217 12/23/217 1/5/218 1/3/218 11/7/217 11/26/217 12/23/217 1/5/218 1/3/218 18
19 Summary At University Lake, a clear negative linear relationship was observed between pco 2 and solar radiation in November, January and February, but such a relationship was not apparent due likely to heavy rainstorms occurred in the month. At Capitol Lake, also a negative but weaker correlation between pco 2 and solar radiation was found in November and January, but such a relation could not be seen in December and February. 19
20 Acknowledgements Louisiana Geological Survey Louisiana State University Agricultural Center Louisiana Water Resources Research Institute The China Scholarship Council Dr. Songjie He Mr. Bingyang Lv
21 Thank you! Rongjie Yang
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