| 摘要: |
| 挥发性卤代烃(volatile halocarbon, VHCs)是大气中一类重要的臭氧层破坏者和环境污染物, 海洋微藻释放是大气VHCs的重要来源, 在调节全球气候中起着至关重要的作用。该研究在2个温度(T=20、25 ℃)和2个CO2分压(pCO2=395、790 mg/L)条件下, 模拟研究了温度和pCO2升高对中肋骨条藻生长和3种VHCs (CHBr3、CHBr2Cl和CHBrCl2)释放量的影响。研究结果表明, pCO2=395 mg/L, T=25 ℃时, 中肋骨条藻的生长情况最佳; pCO2=790 mg/L, T=20 ℃时, 中肋骨条藻的生长情况最差。温度升高时, CHBr3、CHBr2Cl和CHBrCl2的平均浓度分别增加了10.55%、9.45%和12.18%; pCO2升高时, CHBr3和CHBrCl2的平均浓度分别降低了19.29%和30.80%; 温度和pCO2同时升高时, CHBr3和CHBr2Cl的平均浓度分别增加了8.06%和29.02%。该结果表明, 温度和pCO2同时升高对中肋骨条藻VHCs释放产生了协同效应, 加剧了温室气体VHCs的释放。 |
| 关键词: 气候变化 挥发性卤代烃 中肋骨条藻 |
| DOI：10.11693/hyhz20221100304 |
| 分类号:P734.4 |
| 基金项目:国家自然科学基金项目, 41830534号; 山东省自然科学基金项目, ZR2021MD034号; 北部湾大学广西北部湾海洋灾害重点实验室开放基金项目, 2021KF01号。 |
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| EFFECTS OF TEMPERATURE AND pCO2 CHANGES ON THE RELEASE OF VOLATILE HALOCARBON FROM SKELETONEMA COSTATUM |
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YIN Li-Jing1, YANG Bin2, YU Hong1, YANG Gui-Peng1, HE Zhen1
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1.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;2.Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf, Beibu Gulf University, Qinzhou 535011, China
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| Abstract: |
| Volatile halocarbons (VHCs) are important ozone layer destroyers and environmental pollutants in the atmosphere. As an important source of atmospheric VHCs, ocean plays an important role in regulating global climate. We conducted an experiment to simulate this process in combination of 20 ℃ and 25 ℃ vs partial pressure of CO2 (pCO2) of 395 mg/L and 790 mg/L to understand the effects of elevated temperature and pCO2 on the growth and release of VHCs from Skeletonema costatum. Results show that when pCO2=395 mg/L at 25 ℃, the growth of S. costatum was the best and when pCO2=790 mg/L at 20 ℃, the growth was the worst. With the increase of temperature, the average concentration of CHBr3, CHBr2Cl, and CHBrCl2 was increased by 10.55%, 9.45%, and 12.18%, respectively. With the increase of pCO2, the average concentration of CHBr3 and CHBrCl2 was decreased by 19.29% and 30.80%, respectively. When temperature and pCO2 were increased at the same time, the mean concentrations of CHBr3 and CHBr2Cl were increased by 8.06% and 29.02%, respectively. This result further indicated that the simultaneous increase of temperature and pCO2 had a synergistic effect on the release of VHCs from the algae, which further aggravated the release of greenhouse gas VHCs. |
| Key words: climate change volatile halocarbons Skeletonema costatum |
