An evaluation of the time of observation bias adjustment in the U.S. Historical Climatology Network
Article first published online: 23 OCT 2003
Copyright 2003 by the American Geophysical Union.
Geophysical Research Letters
Volume 30, Issue 20, October 2003
How to Cite
2003), An evaluation of the time of observation bias adjustment in the U.S. Historical Climatology Network, Geophys. Res. Lett., 30, 2046, doi:10.1029/2003GL018111, 20., , , , and (
- Issue published online: 23 OCT 2003
- Article first published online: 23 OCT 2003
- Manuscript Accepted: 10 SEP 2003
- Manuscript Revised: 8 SEP 2003
- Manuscript Received: 7 JUL 2003
 The U.S. Historical Climatology Network (HCN) database contains statistical adjustments that address historical changes in observation time at each observing station in the network. A paper in 2002 suggested that these adjustments cause HCN temperature trends to be “spuriously” warm relative to other datasets for the United States. To test this hypothesis, this paper evaluates the reliability of these “time of observation bias” adjustments in HCN. The results indicate that HCN station history information is reasonably complete and that the bias adjustment models have low residual errors. In short, the time of observation bias adjustments in HCN appear to be robust.