snow_water_equivalence_snowfox#
- hydrometlib.cosmos.snow_water_equivalence_snowfox(cts_smo, cts_est)[source]#
Calculate snow water equivalence (SWE) for a below ground (SnowFox) COSMOS sensor [mm water equivalent]
\[\begin{split}\begin{aligned} N^{*} &= \frac{C_{smo}}{C_{est}} \\[4pt] \Lambda &= \frac{1}{\Lambda_{max}} - \left( \frac{1}{\Lambda_{max}} - \frac{1}{\Lambda_{min}} \right) \left( 1 + e^{(a_1 - N^{*}) / a_2} \right)^{-a_3} \\[4pt] SWE &= -\,\frac{10 \, \ln N^{*}}{\Lambda} \end{aligned}\end{split}\]with \(a_1 = 0.3133\), \(a_2 = 0.08268\), \(a_3 = 1.117\), \(\Lambda_{max} = 114.4\) and \(\Lambda_{min} = 14.11\) (Howat et al. 2018). The factor of 10 converts cm to mm.
References
- Wallbank J. R., Cole S. J., Moore R. J., Anderson S. R., Mellor E. J. (2020),
Estimating snow water equivalent using cosmic-ray neutron sensors from the COSMOS-UK network, Hydrological Processes, 35(5), e14048. https://doi.org/10.1002/hyp.14048
- Howat, I. M., de la Peña, S., Desilets, D., & Womack, G. (2018).
Autonomous ice sheet surface mass balance measurements from cosmic rays. The Cryosphere, 12, 2099-2108. https://doi.org/10.5194/tc-12-2099-2018
- Parameters:
cts_smo (
Expr) – Smoothed neutron counts from snowfox sensor, corrected for influences on cosmic-ray intensity [counts h-1]cts_est (
Expr) – Estimated counts during snow periods from snowfox sensor [counts h-1]
- Return type:
Expr- Returns:
Expression or Series for SWE [mm water equivalent]