Preface page .................................................. xi
Acknowledgements ............................................ xiii
List of acronyms .............................................. xv
1 The balance of energy ....................................... 1
Solar radiation ............................................. 1
Infrared radiation and the greenhouse effect ................ 7
Measuring the radiation .................................... 10
Changes in solar activity and climate change ............... 14
References ................................................. 17
2 Thermometry ................................................ 18
Air thermometers ........................................... 18
Liquid-in-glass thermometers ............................... 20
Fixed points and scales .................................... 23
'Centigrade' scales ........................................ 27
The absolute, or thermodynamic, temperature scale .......... 29
The International Practical Temperature Scale .............. 30
Modern thermometers ........................................ 31
Electrical thermometers .................................... 36
Satellite measurements of surface temperature .............. 39
References ................................................. 39
3 Screens, stands and shelters ............................... 40
The need for thermometer protection ........................ 40
The evolution of screens ................................... 40
References ................................................. 52
4 Measuring land surface air temperature ..................... 54
The origin of data ......................................... 54
The instruments ............................................ 55
Met enclosures ............................................. 60
References ................................................. 68
5 Measuring sea surface and marine air temperature ........... 70
A brief history of measurements at sea ..................... 70
Air versus sea temperatures ................................ 71
Definition of 'sea surface temperature' .................... 72
Ships as instrument platforms .............................. 73
Measuring air temperature on ships ......................... 75
Measuring sea surface temperature (SST) from ships ......... 76
Buoys as instrument platforms .............................. 82
References ................................................. 89
6 Measuring sea temperature profiles ......................... 92
The bathythermograph ....................................... 92
Argo: a drifting profiler float ............................ 93
References ................................................ 100
7 Global instrument networks ................................ 102
First station compilations ................................ 102
World Weather Records (WWR) ............................... 103
The Climatic Research Unit (CRU) network .................. 103
The Global Historical Climatology Network (GHCN) .......... 104
The Global Climate Observing System (GCOS) ................ 104
The adequacy of the GCOS network .......................... 109
Using Google Earth to assess GCOS site conditions ......... 111
Disseminating the data .................................... 112
References ................................................ 113
8 From point measurements to global averages ................ 115
Data from the land ........................................ 115
Data from the oceans ...................................... 129
Combining sea and land datasets ........................... 131
References ................................................ 134
9 Changes in air and sea temperatures ....................... 137
The datasets .............................................. 137
Causes of temperature change .............................. 139
Hemispheric and global temperature changes since 1850 ..... 150
Central England Temperature since 1659 .................... 171
Changes in maximum and minimum temperatures ............... 176
References ................................................ 185
10 Temperature profiles through the atmosphere ............... 187
Early measurements ........................................ 187
Radiosondes ............................................... 188
Sounders .................................................. 195
Temperature profiles from sonde data ...................... 198
References ................................................ 204
11 Future climate measurements ............................... 206
The Global Climate Observing System ....................... 206
A new instrument network .................................. 207
Design of the new stations ................................ 208
Data telemetry ............................................ 211
Site locations ............................................ 211
Cost and management ....................................... 212
Concluding remarks ........................................ 212
References ................................................ 212
Appendix A The gas laws ..................................... 213
Appendix В Relative humidity and dew point .................. 214
Appendix С The electromagnetic spectrum ..................... 216
Appendix D Satellite measurements of surface temperature .... 219
Appendix E Metadata ......................................... 226
Appendix F The Southern Oscillation Index ................... 227
Index ........................................................ 228
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