| Preface | p. xi |
| Acknowledgements | p. xiii |
| List of acronyms | p. xv |
| The balance of energy | p. 1 |
| Solar radiation | p. 1 |
| Infrared radiation and the greenhouse effect | p. 7 |
| Measuring the radiation | p. 10 |
| Changes in solar activity and climate change | p. 14 |
| References | p. 17 |
| Thermometry | p. 18 |
| Air thermometers | p. 18 |
| Liquid-in-glass thermometers | p. 20 |
| Fixed points and scales | p. 23 |
| 'Centigrade' scales | p. 27 |
| The absolute, or thermodynamic, temperature scale | p. 29 |
| The International Practical Temperature Scale | p. 30 |
| Modern thermometers | p. 31 |
| Electrical thermometers | p. 36 |
| Satellite measurements of surface temperature | p. 39 |
| References | p. 39 |
| Screens, stand sand shelters | p. 40 |
| The need for thermometer protection | p. 40 |
| The evolution of screens | p. 40 |
| References | p. 52 |
| Measuring land surface air temperature | p. 54 |
| The origin of data | p. 54 |
| The instruments | p. 55 |
| Met enclosures | p. 60 |
| References | p. 68 |
| Measuring sea surface and marine air temperature | p. 70 |
| A brief history of measurements at sea | p. 70 |
| Air versus sea temperatures | p. 71 |
| Definition of 'sea surface temperature' | p. 72 |
| Ships as instrument platforms | p. 73 |
| Measuring air temperature on ships | p. 75 |
| Measuring sea surface temperature (SST) from ships | p. 76 |
| Buoys as instrument platforms | p. 82 |
| References | p. 89 |
| Measuring sea temperature profiles | p. 92 |
| The bathythermograph | p. 92 |
| Argo: a drifting profiler float | p. 93 |
| References | p. 100 |
| Global instrument networks | p. 102 |
| First station compilations | p. 102 |
| World Weather Records (WWR) | p. 103 |
| The Climatic Research Unit (CRU) network | p. 103 |
| The Global Historical Climatology Network (GHCN) | p. 104 |
| The Global Climate Observing System (GCOS) | p. 104 |
| The adequacy of the GCOS network | p. 109 |
| Using Google Earth to assess GCOS site conditions | p. 111 |
| Disseminating the data | p. 112 |
| References | p. 113 |
| From point measurements to global averages | p. 115 |
| Data from the land | p. 115 |
| Data from the oceans | p. l29 |
| Combining sea and land datasets | p. 131 |
| References | p. 134 |
| Changes in air and sea temperatures | p. 137 |
| The datasets | p. 137 |
| Causes of temperature change | p. 139 |
| Hemispheric and global temperature changes since 1850 | p. 150 |
| Central England Temperature since 1659 | p. 171 |
| Changes in maximum and minimum temperatures | p. 176 |
| References | p. 185 |
| Temperature profiles through the atmosphere | p. 187 |
| Early measurements | p. 187 |
| Radiosondes | p. 188 |
| Sounders | p. 195 |
| Temperature profiles from sonde data | p. 198 |
| References | p. 204 |
| Future climate measurements | p. 206 |
| The Global Climate Observing System | p. 206 |
| A new instrument network | p. 207 |
| Design of the new stations | p. 208 |
| Data telemetry | p. 211 |
| Site locations | p. 211 |
| Cost and management | p. 212 |
| Concluding remarks | p. 212 |
| References | p. 212 |
| The gas laws | p. 213 |
| Relative humidity and dew point | p. 214 |
| The electromagnetic spectrum | p. 216 |
| Satellite measurements of surface temperature | p. 219 |
| Metadata | p. 226 |
| The Southern Oscillation Index | p. 227 |
| p. 228 |
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