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The seasonal cycle of N 2 O
Author(s) -
Liao Ting,
Camp Charles D.,
Yung Yuk L.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl020345
Subject(s) - multitaper , environmental science , water cycle , sampling (signal processing) , seasonality , climatology , amplitude , meteorology , annual cycle , atmospheric sciences , statistics , mathematics , geology , geography , physics , ecology , quantum mechanics , detector , optics , biology
We have carried out an empirical study of the seasonal cycle of nitrous oxide (N 2 O) using the data archived by the National Oceanic and Atmospheric Administration – Climate Monitoring and Diagnostics Laboratory (NOAA‐CMDL) Global Cooperative Air Sampling Network from 1977 to 2000. In order to isolate the seasonal cycle, we first detrended the data using least square polynomial fits. The remaining variability was averaged to extract the seasonal cycle, which has an amplitude of about 0.8 ppbv. The statistical significance of the seasonal signal was established using the multitaper method and Welch's method for power spectrum analysis.