Robert J. Hargreaves

Relative drifts and biases between six ozone limb satellite measurements from the last decade

Abstract. As part of European Space Agencys (ESA) climate change initiative, high vertical resolution ozone profiles from three instruments all aboard ESAs Envisat (GOMOS, MIPAS, SCIAMACHY) and ESAs third party missions (OSIRIS, SMR, ACE-FTS) are to be combined in order to create an essential climate variable data record for the last decade. A prerequisite before combining data is the examination of differences and drifts between the data sets. In this paper, we present a detailed analysis of ozone profile differences based on pairwise collocated measurements, including the evolution of the differences with time. Such a diagnosis is helpful to identify strengths and weaknesses of each data set that may vary in time and introduce uncertainties in long-term trend estimates. The analysis reveals that the relative drift between the sensors is not statistically significant for most pairs of instruments. The relative drift values can be used to estimate the added uncertainty in physical trends. The added drift uncertainty is estimated at about 3 % decade−1 (1σ). Larger differences and variability in the differences are found in the lowermost stratosphere (below 20 km) and in the mesosphere.

Small carbon chains in circumstellar envelopes

Observations were made for a number of carbon-rich circumstellar envelopes using the Phoenix spectrograph on the Gemini South telescope to determine the abundance of small carbon chain molecules. Vibration-rotation lines of the

Hot Methane Line Lists for Exoplanet and Brown Dwarf Atmospheres

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EMPIRICAL LINE LISTS AND ABSORPTION CROSS SECTIONS FOR METHANE AT HIGH TEMPERATURES

antisymmetric stretch of C

Harmonized dataset of ozone profiles from satellite limb and occultation measurements

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HOT NH3 SPECTRA FOR ASTROPHYSICAL APPLICATIONS

near 2040 cm

HIGH-RESOLUTION 1.6 μm SPECTRA OF FeH IN M AND L DWARFS* , **

^{-1}

Ammonia line lists from 1650 to 4000 cm−1

(4.902

Analysis of high temperature ammonia spectra from 780 to 2100 cm(-1)

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Greenhouse gas measurements over a 144 km open path in the Canary Islands

m) have been used to determine the column density for four carbon-rich circumstellar envelopes: CRL 865, CRL 1922, CRL 2023 and IRC +10216. We additionally calculate the column density of C