Integrated water vapor above Ny Ålesund, Spitsbergen: a multi-sensor intercomparison M. Pałm1, C. Melsheimer1, S. Noël1, S. Heise2, J. Notholt1, J. Burrows1, and O. Schrems3 1Institute of Environmental Physics, Universität Bremen, Germany 2Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany 3Alfred Wegener Institut, Bremerhaven, Germany
Abstract. Water vapor is an important constituent of the atmosphere. Because
of its abundance and its radiative properties it plays an important
role for the radiation budget of the atmosphere and has major
influence on weather and climate.
In this work integrated water vapor (IWV) derived
from the measurements of three satellite sensors, GOME, SCIAMACHY
and AMSU-B, two ground based sensors, a Fourier-transform
spectrometer (FTIR), a microwave radiometer for O3 (RAM) and
IWV inferred from GPS zenith path delay (ZPD) measurements, are
compared to radio-sonde measurements above Ny Ålesund, 79° N.
All six remote sensors exploit different principles and work in
different wavelength regions.
All remote sensing instruments reproduce the sonde measurements very
well and are highly correlated when compared with the radio-sonde
The ground-based FTIR shows very little scatter of about 10%. The
GPS performs similar to the FTIR at all times except for very low
IWV, where the scatter exceeds 50% of the measured IWV. The other
remote sensing instruments show scatter of about 20% (standard
deviation). The ground-based RAM performs similar to the satellite
instruments, despite the fact that the retrieval of IWV is just a
by-product of this ozone sensor.
Citation: Pałm, M., Melsheimer, C., Noël, S., Heise, S., Notholt, J., Burrows, J., and Schrems, O.: Integrated water vapor above Ny Ålesund, Spitsbergen: a multi-sensor intercomparison, Atmos. Chem. Phys., 10, 1215-1226, doi:10.5194/acp-10-1215-2010, 2010.