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III

Preface to the Second Edition

The World Climate Research Programme (WCRP) Baseline Surface Radiation Network (BSRN) has been

operating as a network of surface radiation monitoring observatories for over 10 years. During this time period

significant progress has been made in the measurement of various radiation quantities. Others have not

progressed as rapidly. Observations of other quantities are now being requested by the user community. The

process of improving measurements and the requirement for more information about the atmosphere and the

radiation budget at the surface will continue indefinitely. The second edition of this manual recognizes the

improvements that have been made during the time since the writing of the first edition. This is most evident

in the inclusion of a chapter on the measurement of aerosol optical depth. Many advances that one would

anticipate in a manual of this type have yet to be included, however, because questions remain about the

veracity of these, they have not been left for a later addition until they prove themselves. In a number of

cases, the thermal offset problem being the most notable, suggestions have been included in the hope that

more research will proceed in these areas, especially in the various climatic regions of the network.

Overall, the manual has been updated in a variety of places, rearranged where it was believed the flow could

be improved and the Annexes that were considered dated removed. In turn, several new Annexes were

included to provide the users of the manual more information on instruments and methods of observation.

It is hoped that readers of this second version will find the overall presentation improved and therefore more

useful.

Bruce McArthur

Experimental Studies Division

Meteorological Service of Canada

4905 Dufferin Street

Downsview, Ontario, CANADA

M3H 5T4

Telephone: 1 416 739 4464

Facsimile: 1 416 739 4281

Email: bruce.mcarthur@ec.gc.ca

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