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UP: Fachverband Umweltphysik

UP 5: Atmosphäre - Spurengase

UP 5.2: Vortrag

Mittwoch, 19. März 2014, 10:00–10:15, MAG 100

The seasonal cycle of total column CO₂ and CH₄ in the high Arctic — •Matthias Buschmann, Nicholas Deutscher, Mathias Palm, Thorsten Warneke, Tine Weinzierl, and Justus Notholt — Institut für Umweltphysik, Universität Bremen, Bremen, Deutschland

The measurement of long-lived greenhouse gases, like CO₂ and CH₄, and identification of their sources and sinks is very important in the context of climate change research. Networks like the TCCON (Total Carbon Column Observing Network) continuously monitor a variety of trace gases in the atmosphere by employing ground based Fourier Transform InfraRed (FTIR) spectroscopy on solar radiation in the near infrared (NIR). However, at high latitude sites (like Ny Ålesund, Spitzbergen at 79^∘ N), there is no direct sunlight in winter due to the polar night and the moon is the next best source of NIR radiation. In this talk we will present the first record of the seasonal cycle of carbon dioxide and methane derived from solar absorption spectra in summer and lunar absorption spectra in the winter.