org > Optical Rain GaugeInstrument Type(s) > Baseline

The ORG measures rainfall by detecting the optical irregularities induced within the sample volume by precipitating particles falling through a beam of partially coherent infrared light. These irregularities are known as scintillation. By detecting the intensity of the scintillation, the actual rainfall rate can be measured.

This particular rain gauge is an optical independent analog unit consisting of a frame that contains 1) the transmit head, 2) a receive head and electronics, and 3) a 15-meter-long power/signal cable. The transmit head contains an infrared-emitting diode and lens with heater. The other head contains a photodiode, lens and aperture, heater, electronics, and cable connectors. All wiring between the heads runs within the frame.

Primary Measurements


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Active Locations

Facility Name Start Date
La Jolla, CA; Supplemental Facility 2 (Mt Soledad lab) 2023-01-15


Emmenegger T, Y Kuo, S Xie, C Zhang, C Tao, and J Neelin. 2022. "Evaluating Tropical Precipitation Relations in CMIP6 Models with ARM data." Journal of Climate, 35(19), 10.1175/JCLI-D-21-0386.1.


Petäjä T, K Tabakova, A Manninen, E Ezhova, E O’Connor, D Moisseev, V Sinclair, J Backman, J Levula, K Luoma, A Virkkula, M Paramonov, M Räty, M Äijälä, L Heikkinen, M Ehn, M Sipilä, T Yli-Juuti, A Virtanen, M Ritsche, N Hickmon, G Pulik, D Rosenfeld, D Worsnop, J Bäck, M Kulmala, and V Kerminen. 2021. "Influence of biogenic emissions from boreal forests on aerosol–cloud interactions." Nature Geoscience, 15(1), 10.1038/s41561-021-00876-0.


Serra Y, A Rowe, D Adams, and G Kiladis. 2020. "Kelvin Waves during GOAmazon and Their Relationship to Deep Convection." Journal of the Atmospheric Sciences, 77(10), 10.1175/JAS-D-20-0008.1.
Research Highlight


Zheng Y and Z Li. 2019. "Episodes of warm‐air advection causing cloud‐surface decoupling during the MARCUS." Journal of Geophysical Research: Atmospheres, 124(22), 10.1029/2019JD030835.
Research Highlight

Tridon F, C Planche, K MROZ, S Banson, A Battaglia, J Van Baelen, and W Wobrock. 2019. "On the realism of the rain microphysics representation of a squall line in the WRF model. Part I: Evaluation with multi-frequency cloud radar Doppler spectra observations." Monthly Weather Review, 147(8), 10.1175/MWR-D-18-0018.1.

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