Citation:

s11434-010-4119-y

Name: Seawater carbonate chemistry, chlorophyll a and photosynthetic carbon fixation rate under different light and pCO2 conditions during experiments, 2010
Published: 2010
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

We carried out short term pCO2/pH perturbation experiments in the coastal waters of the South China Sea to evaluate the combined effects of seawater acidification (low pH/high pCO2) and solar UV radiation (UVR, 280–400 nm) on photosynthetic carbon fixation of phytoplankton assemblages. Under photosynthetically active radiation (PAR) alone treatments, reduced pCO2 (190 ppmv) with increased pH resulted in a significant decrease in the photosynthetic carbon fixation rate (about 23%), while enriched pCO2 (700 ppmv) with lowered pH had no significant effect on the photosynthetic performance compared to the ambient level. The apparent photosynthetic efficiency decreased under the reduced pCO2 level, probably due to C-limitation as well as energy being diverged for up-regulation of carbon concentrating mechanisms (CCMs). In the presence of UVR, both UV-A and UV-B caused photosynthetic inhibition, though UV-A appeared to enhance the photosynthetic efficiency under lower PAR levels. UV-B caused less inhibition of photosynthesis under the reduced pCO2 level, probably because of its contribution to the inorganic carbon (Ci)-acquisition processes. Under the seawater acidification conditions (enriched pCO2), both UV-A and UV-B reduced the photosynthetic carbon fixation to higher extents compared to the ambient pCO2 conditions. We conclude that solar UV and seawater acidification could synergistically inhibit photosynthesis.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Experimental treatment	Exp treat		Gao, Kunshan
2	Experimental treatment	Exp treat		Gao, Kunshan
3	Julian day	Julian day		Gao, Kunshan
4	Salinity	Sal		Gao, Kunshan	Measured
5	Temperature, water	Temp	°C	Gao, Kunshan	Measured
6	pH	pH		Gao, Kunshan	pH meter (Orion)	NBS scale, H+ ion concentration in µmol/l
7	pH, standard deviation	pH std dev	±	Gao, Kunshan
8	Carbon, inorganic, dissolved	DIC	µmol/l	Gao, Kunshan	Total organic analyzer (TOC 5000A Shimazdu)
9	Carbon, inorganic, total, standard deviation	TIC std dev	±	Gao, Kunshan
10	Bicarbonate	[HCO3]-	mmol/l	Gao, Kunshan	Calculated using CO2SYS
11	Bicarbonate ion, standard deviation	[HCO3]- std dev	±	Gao, Kunshan
12	Carbonate ion	[CO3]2-	µmol/l	Gao, Kunshan	Calculated using CO2SYS
13	Carbonate ion, standard deviation	[CO3]2- std dev	±	Gao, Kunshan
14	Carbon dioxide, total	TCO2	µmol/l	Gao, Kunshan	Calculated using CO2SYS
15	Carbon dioxide, standard deviation	CO2 std dev	±	Gao, Kunshan
16	pH	pH		Gao, Kunshan	Calculated	NBS scale, H+ ion concentration in µmol/kg
17	Carbonate system computation flag	CSC flag		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
18	pH	pH		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)	Total scale, H+ ion concentration in µol/kg
19	Carbon dioxide	CO2	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
20	Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)	pCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
21	Fugacity of carbon dioxide (water) at sea surface temperature (wet air)	fCO2water_SST_wet	µatm	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
22	Bicarbonate ion	[HCO3]-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
23	Carbonate ion	[CO3]2-	µmol/kg	Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
24	Carbon, total	TC	µmol/kg	Gao, Kunshan	Calculated
25	Alkalinity, total	AT	µmol/kg	Gao, Kunshan	Calculated using CO2SYS
26	Aragonite saturation state	Omega Arg		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
27	Calcite saturation state	Omega Cal		Nisumaa, Anne-Marin	Calculated using seacarb after Nisumaa et al. (2010)
28	Photochemical efficiency	delta F/Fm	arbitrary units	Gao, Kunshan	Calculated, see reference(s)
29	Photochemical efficiency, standard deviation	delta F/Fm std dev	±	Gao, Kunshan
30	Light saturation point	Ik		Gao, Kunshan
31	Light saturation point, standard deviation	Ik std dev	±	Gao, Kunshan
32	Maximum potential photosynthesis	Pmax		Gao, Kunshan
33	Maximum potential photosynthesis, standard deviation	Pmax std dev	±	Gao, Kunshan
34	Radiation, photosynthetically active	PAR	W/m²	Gao, Kunshan
35	Chlorophyll a	Chl a	µg/l	Gao, Kunshan	Spectrophotometry
36	Photosynthetic carbon fixation rate	C fix	µmol/µg/h	Gao, Kunshan	Liquid scintillation
37	Photosynthetic carbon fixation rate, standard deviation	C fix std dev	±	Gao, Kunshan

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