Temporal and spatial variations of nitrous oxide fluxes from the littoral zones of three alga-rich lakes in coastal Antarctica

摘要: Abstract Nitrous oxide (N 2 O) fluxes across air–water interface were investigated in the littoral zones of three alga-rich lakes (Lake Mochou , Lake Tuanjie and Daming ) east Antarctica during summers 2007/2008 2008/2009. In these lakes, mean N O 3.1 ± 6.7 μgN O–N m −2  h −1 2.5 ± 2.8 7.2 ± 6.9 respectively. The showed a large temporal spatial variation lake zones. On whole, emission sources for atmospheric although negative occurred on most observation sites. flux significantly correlated with NO 3 − –N concentration sediments at each site, suggesting that variations have connection concentration. seasonal pattern was positively related to daily radiation air temperature negatively water depth, indicating factors alga activity had an important effect emissions. The summertime budget estimated be 6.7 mg O–N m 5.4 mg 15.6 mg from Our results indicated emissions could regional importance coastal Antarctica.