Potentiometry (pH meter) 173 Radiosonde with radar tracking 328 Passive Samplers [general] 167 Barometer, mercury column 73 Alpha counting after electrostatic collection of measurand. Electrostatic collection + alpha counting 346 Volumetric measurement 211 Radio detection and ranging (Radar) 183 Alpha counting 64 Thermometer-Thermoelement 202 Colorimetry (thorin) 91 Optical particle counter (OPC) 240 Twomey static thermal diffusion chamber 242 Differential mobility particle sizer (DMA, DMPS) 234 Pyranometer (measurement of IR radiation) 179 Particle induced x-ray emission (PIXE) 223 Sonic thermometer 195 Bowen-ratio method 77 Electronic pressure transducer (silicon diaphragm) 111 Brewer-GDR 79 Wind vane (solid blade) 215 SAOZ (UV-vis diode array spectrometer) 189 IR absorption hygrometer 255 Cup anemometer 95 Flexpart (dispersion modeling) 246 Flow injection analyzer (FIA) 121 Elastic backscatter light detection and ranging (lidar) typically used for measurements of cloud and aerosol particle phase optical properties (e.g., extinction and backscatter coefficient), altimetry, ocean optical properties, and mixed layer height. Backscatter lidar 341 Chemiluminescence (CL) [general] 290 Aerodynamic particle sizing spectrometer (APS) 227 Disdrometer (drop spectrographs) 102 Filter sampling + combustion + IC 281 Spectral pyranometer 267 Filter + beta attenuation (betameter, beta gauge) 219 Colorimetry (indophenol, Bertholet) 273 Denuder 99 ICP-AES 133 Electrostatic classifier 237 Gradient method 125 Quantum cascade laser (QCL) spectroscopy 311 GC-MS 303 Microbarometer (dewar) 150 Fluorescence [general] 294 Faraday cup photochemistry 114 Scatterometer 190 Light detection and ranging (lidar) with Doppler capability (direct and coherent mode), typically used for measurements of winds. Doppler wind lidar 142 Dobson 106 Liquid-in-glass thermometer (mercury-free) 144 TCCON Fourier-transform IR spectroscopy (TCCON-FTIR) 323 Filter sampling + gravimetry 285 Lagranto (trajectory modeling) 249 Ion Chromatography (IC) [general] 137 Light absorption photometry 315 Integrated cavity output spectroscopy (ICOS) 307 Gas chromatography and detection by cold vapour atomic fluorescence spectrometry. GC-CVAFS 344 Microwave radiometry 156 Radio acoustic sounding system (RASS) 181 Adsorption - scintillation counting 62 Light detection and ranging (lidar) with differential absorption lidar (DIAL) capability, typically used for trace gas measurements, most notably ozone and water vapor. This technique can be extended to molecules which have suitably defined differential absorption characteristics. Differential absorption lidar (DIAL) 335 Potentiometry (ion-selective electrode) 172 Radiosonde with NAVAID 327 Brewer-Mast Sonde 80 Nephelometry, integrating 230 Condensation particle counter (CPC) 232 BSRN compliant instrument 72 UV absorption spectrometry-radiometry 319 Determination of the counts measured per unit time as a result of radionuclide decay. Radionuclide decay counting [general] 348 Radiochemical Methods [general] 185 UV spectroradiometry 339 Aneroid barometer (evacuated capsule) 66 Atmometer 68 Tipping bucket rain gauge (totalizer) 204 Sun-tracking photometry 244 Carbon-Iodine Sonde (KC Sonde) 84 (Ultra)sonic ranger 260 Bimetal thermometer 76 Wind sock (textile tube) 214 Lithium chloride (LiCl) 252 Hygrometer [general] 254 Sunphotometry-Filter Radiometry 197 Surface chamber 199 Radiosonde with composite method tracking 330 Colorimetry (ANSA) 271 (Ruler for) rain gauge 59 Transport modeling (model unspecified) 208 Cuvette 97 Diffusion battery 235 Colorimetric titration [general] 88 Flux variance method 123 X-ray fluorescence (XRF) 226 GC-FID 301 Pyranometer (global solar, broadband) 266 EUSAAR protocol 218 Electrical aspiration (Frankenberger type) 258 Differential optical absorption (DOAS) 321 Filter sampling + extraction + IC 283 Flextra (trajectory modeling) 247 Sunshine duration is determined by evaluating the burnt areas imprinted by the sun in a strip of carton or aluminum foil placed behind a glass sphere. Campbell-Stokes burn method 415 Indian Sonde 135 Colorimetry (sodium salicylate method for nitrate) 277 Multistage impactor 239 Proton transfer reaction mass spectrometry (PTR-MS) 313 Filter sampling + photo multiplier tube (PMT) 293 Dissipation method 105 Cavity ring-down spectroscopy (CRDS) 305 Microwave profiler 154 Lysimeter 146 Pluviograph 170 Magnetron 325 Catalytic conversion 'Mb' - CL 289 Atomic absorption spectrophotometry (AAS) 70 Mass Spectrometry (MS) [general] 221 Non-dispersive IR (NDIR) absorption 317 Eddy covariance method 109 Human observation 24 Laser photoacoustic spectroscopy (LPAS) 309 NILU_O_3 158 Pressure balance (piston) 174 Pressure tube 176 Radiosonde with radiotheodolite tracking 329 Capacitive rain sensor 82 Photoacoustic detection 168 None of the codes in the table are applicable in the context of this particular observation. inapplicable inapplicable Barometer, mercury-free column 74 Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS). Tunable Infrared Laser Differential Absorption Spectroscopy (TILDAS) 347 Weighing type rain gauge (totalizer) 212 Radio detection and ranging (Radar) profiler 184 Thin film capacitance 250 Scanning mobility particle sizer (SMPS) 241 Snow pillow 262 Particle soot absorption photometry (PSAP) 224 Sound detection and ranging (Sodar) profiler 196 Brewer 78 Estimation from visual observation 112 Pyrheliometer (direct solar, broadband) 264 Optical hygrometer 256 Cup anemometer (3 or 4 cups) 96 Measurement/observing method (atmosphere) Flask sampling (analytical method unspecified) 120 Atmospherics ('sferics') detection 69 Colorimetry (NEDA) 275 Light detection and ranging (lidar) with high spectral resolution capability, typically used for measurements of cloud and aerosol particle phase properties, ocean properties, and mixed layer height. High spectral resolution (HSR) lidar 342 A thermometer having a bulb that is kept moistened when humidity determinations are being made with a psychrometer. The wet-bulb temperature is the temperature a parcel of air would have if it were cooled to saturation (100% relative humidity) by the evaporation of water into it, with the latent heat being supplied by the parcel. Wet-bulb thermometer 340 Photolytic conversion - CL 291 Aerosol backscatter sonde 228 Disjunct eddy covariance method 103 UV-vis spectrometry-radiometry 268 Multiangle absorption photometry (MAAP) 238 Catalytic conversion 'Au' - CL 287 Gas chromatography and detection by cold vapour atomic fluorescence spectrometry. GC-CVAFS 417 Microtops 151 Filter sampling (analytical method unspecified) 279 Filter sampling + alpha counting 115 Separation + manometric determination 191 UV fluorescence 295 Gas Chromatography (GC) [general] 297 ECC Sonde 107 Mechanical aspiration 259 Ozone sonde (unspecified) 166 Gas chromatography and detection by a thermal conductivity detector. GC-TCD 345 Radio acoustic sounding system (RASS) 182 NILU_O_2 157 Flame-ionization detector (FID) 119 Aerovane (wind vane with propeller) 63 Colorimetry (Saltzman) 90 Thermocouple, thermopile 201 Mercury-in-glass thermometer 149 High Performance Liquid Chromatography (HPLC) 129 Continuous gravimetry 233 Electric conductivity (EC meter) 110 Infrared absorption measurement based on the gas-filter correlation technique, a specifique variant of NDIR. IR-GFC 349 Regener Sonde (chemiluminescence) 186 Anion exchange membrane (AEM) 67 Resistance thermometer, thermistor 188 Titration 205 Conductometry 94 Ceilometer 245 Gradiated pole 261 Adsorption tube (charcoal) + elution + GC 280 Radiosonde (tracking unspecified) 331 Colorimetry (Griess) 272 Turbidity measurement 209 Hot wire anemometer 130 Denuder 98 Hypsometer (water boiling point) 132 Electric mobility [general] 236 Laser spectroscopy [general] 310 GC-HgO reduction-UV absorption 302 Light detection and ranging (lidar) with Raman capability, typically used for measurements of aerosol particle phase and cloud measurements as well as water vapor and temperature. Raman lidar 143 Pyrradiometer (total global, UV+IR) 180 Fourier-transform IR spectroscopy (FTIR) 322 Filter sampling + extraction + other 284 Impregnated filter 286 Hysplit (trajectory modeling) 248 Sunshine duration is determined by combining multi-sensor detectors with an electronic discriminator. Contrast-evaluating and scanning devices 416 Interferential method 136 Colorimetry [general] 278 IR spectrometry-radiometry [general] 314 Umkehr method 210 Cavity-enhanced absorption spectroscopy (CEAS) 306 Microtops 153 Microwave radiometry 155 Potassium iodide (KI) method 171 Mass balance method 147 GC-ECD-FID 299 Klystron 326 The measurement/observing method is unknown. unknown unknown Cloud condensation nuclei (CCN) counter 231 Gravimetry [general] 127 Atomic emission spectrophotometry (AES) 71 Monitor for AeRosols and GAses (MARGA) 222 Non-dispersive UV (NDUV) 318 Anemometer [general] 65 Tunable diode lase spectroscopy (TDLS) Tunable diode lase spectroscopy (TDLS) 338 Pressure plate (solid blade) 175 Propeller anemometer 177 Capillary electrophoresis (CE) 83 Beta counting 75 Wet Chemical Methods [general] 213 Chilled mirror 251 Hair hygrometer-hygrograph 253 Sunshine duration 198 17 (Optical) filter Instrument 58 Tetrachloromercurate (TCM) absorption - CL 270 Transmissometer 207 Colorimetric titration (Gran method) 87 Thermo-optical analyzer (Sunset Labs) 225 GC-ECD-MS 300 Bimetallic actinograph 263 Evaporation pan and-or tank 113 Pyrgeometer (global, infrared) 265 Aerodyne mass spectrometer (AMS) 217 2024-01-02T17:12:40.983Z Detection of UV fluorescence signal emitted by the excited OH radical produced from H2O after dissociation using UV light. UV fluorescence-based hygrometer (Lyman-α) 257 Light detection and ranging (lidar) with integrated path differential absorption (IPDA) capability, typically used for column measurements of CH4 and CO2. Integrated path differential absorption (IPDA) lidar 320 Filter sampling + combustion + other 282 Collection of fog using a mesh or similar capturing device and subsequent determination of the equivalent volume or mass of water. Fog collection 414 Colorimetry (mercury thiocyanate+iron alum) 274 ICP-MS 134 Colorimetry (Nessler, K2HgI4) 276 Chemical ionization MS (CIMS) with matrix isolation 312 Monitor for AeRosols and GAses (MARGA) Metrohm 292 Light scattering 229 Light detection and ranging (lidar) capable of determining the linear or circular depolarization ratio, typically used to discriminate spherical and non-spherical particles. Polarized lidar 343 H2O2 conversion - IC 304 Light detection and ranging (Lidar) profiler for temperature measurements Lidar for temperature observations 269 Pilot balloon with optical tracking) 332 Catalytic conversion 'Fe' - CL 288 Gas chromatography and detection by a thermal conductivity detector. GC-TCD 418 Microtops 152 Filter + light attenuation (aethalometer) 220 Filter sampling + gamma spectrometry 116 (Ultra)sonic anemometer 60 Long path absorption photometry (LOPAP) 316 Vacuum UV fluorescence 296 GC-ECD 298 Eddy accumulation method 108 Laser induced fluorescence (LIF) 308 Microwave radiometry 336 Measurement/observing method (atmosphere)