Effects of orbital decay on satellite-derived lower-tropospheric temperature trends

ABSTRACT The 17-year lower-tropospheric temperature record derived from the satellite Microwave Sounding Unit (MSU)1,2,3 shows a global cooling trend, from 1979 to 1995, of −0.05 K per

decade at an altitude of about 3.5 km (refs 4, 5). Air temperatures measured at the Earth's surface, in contrast, have risen by approximately +0.13 K per decade over the same period4,6.

The two temperature records are derived from measurements of different physical parameters, and thus are not directly comparable. In fact, the lower stratosphere is cooling substantially

(by about −0.5 K per decade)5, so the warming trend seen at the surface is expected to diminish with altitude and change into a cooling trend at some point in the troposphere. Even so, it

has been suggested that the cooling trend seen in the satellite data is excessive4,7,8. The difficulty in reconciling the information from these different sources has sparked a debate in the

climate community about possible instrumental problems and the existence of global warming4,7,9. Here we identify an artificial cooling trend in the satellite-derived temperature series

caused by previously neglected orbital-decay effects. We find a new, corrected estimate of +0.07 K per decade for the MSU-based temperature trend, which is in closer agreement with surface

temperatures. We also find that the reported7 cooling of the lower troposphere, relative to the middle troposphere, is another artefact caused by uncorrected orbital-decay effects. Access

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DISCREPANCIES IN TROPICAL TROPOSPHERE WARMING ESTIMATES Article Open access 21 June 2024 REFERENCES * Spencer, R. W. & Christy, J. R. Precise monitoring of global temperature trends from

satellites. _Science_ 247, 1558–1562 (1990). Article  ADS  CAS  Google Scholar  * Spencer, R. W. & Christy, J. R. Precision and radiosonde validation of satellite gridpoint temperature

anomalies. Part II: A tropospheric retrieval and trends during 1979–90. _J. Clim._ 5, 858–866 (1992). Article  ADS  Google Scholar  * Christy, J. R. & McNider, R. T. Satellite greenhouse

signal. _Nature_ 367, 325 (1994). Article  ADS  Google Scholar  * Hurrell, J. W. & Trenberth, K. E. Difficulties in obtaining reliable temperature trends: Reconciling the surface and

satellite MSU2R trends. _J. Clim._(in the press). * Houghton, J. T. et al. (eds) _Climate Change 1995: The Science of Climate Change_ (Cambridge Univ. Press, (1996)). Google Scholar  *

Jones, P. D. Recent warming in global temperature series. _Geophys. Res. Lett._ 21, 1149–1152 (1994). Article  ADS  Google Scholar  * Hurrell, J. W. & Trenberth, K. E. Spurious trends in

satellite MSU temperatures from merging different satellite records. _Nature_ 386, 164–167 (1997). Article  ADS  CAS  Google Scholar  * Hansen, J. et al. Satellite and surface temperature

data at odds? _Clim. Change_ 30, 103–117 (1995). Article  ADS  Google Scholar  * Christy, J. R., Spencer, R. W. & Braswell, W. D. How accurate are satellite ‘thermometers’? _Nature_ 389,

342–342 (1997). Article  ADS  CAS  Google Scholar  * Hansen, J. et al. Forcings and chaos in interannual to decadal climate change. _J. Geophys. Res._ 102, 25679–25720 (1997). Article  ADS

  CAS  Google Scholar  * Willson, R. C. Total solar irradiance trend during solar cycles 21 and 22. _Science_ 277, 1963–1965 (1997). Article  ADS  CAS  Google Scholar  * Wentz, F. J.

Awell-calibrated ocean algorithm for special sensor microwave/imager. _J. Geophys. Res._ 102, 8703–8718 (1997). Article  ADS  Google Scholar  * Liebe, H. J. An updated model for millimeter

wave propagation in moist air. _Radio Sci._ 20, 1069–1089 (1985). Article  ADS  Google Scholar  * Gaffen, D. Temporal inhomogeneities in radiosonde temperature records. _J. Geophys. Res._

99, 3667–3676 (1994). Article  ADS  Google Scholar  Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Remote Sensing Systems, 438 First Street, Suite 200, Santa Rosa, 95401,

California, USA Frank J. Wentz & Matthias Schabel Authors * Frank J. Wentz View author publications You can also search for this author inPubMed Google Scholar * Matthias Schabel View

author publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Frank J. Wentz. RIGHTS AND PERMISSIONS Reprints and permissions ABOUT

THIS ARTICLE CITE THIS ARTICLE Wentz, F., Schabel, M. Effects of orbital decay on satellite-derived lower-tropospheric temperature trends. _Nature_ 394, 661–664 (1998).

https://doi.org/10.1038/29267 Download citation * Received: 24 February 1998 * Accepted: 07 July 1998 * Issue Date: 13 August 1998 * DOI: https://doi.org/10.1038/29267 SHARE THIS ARTICLE

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