Q n
Normalized sand flux
q
Specific humidity; radiative transfer in a given direction; sand mass
transport
q
:
Internal energy per unit volume
R
Constant for ideal gases; particle radius
R b
Blackbody emissive power
RCP
Representative Concentration Pathway (of CO 2 )
Re
Reynolds number
Re p
Reynolds number of particles
R h
Hydraulic radius
Ri c
Critical Richardson number
Ri f
Flux Richardson number
Ri g
Gradient Richardson number
Ri m
Mass Richardson number
R n
Radiative balance
R ref
Ecosystem respiration at reference temperature
R(T)
Total respiration
r
Mixing ratio
r AB
Linear correlation between two arbitrary variables
r aH
Aerodynamic resistance to sensible heat transfer
r M
Aerodynamic resistance to vertical momentum transfer
r aS
Aerodynamic resistance to transfer of a hypothetical gas
r aV
Aerodynamic resistance to water vapor transfer
r c
Canopy resistance
r r
Resistance to longwave radiation
r hr
Combined resistance for sensible heat loss and longwave radiation
S
Water channel slope
S b
Direct solar radiation flux
S d
Diffuse solar radiation flux
S e
Rate of energy transfer to stream bed
S h
Mean monthly total solar radiation flux outside the atmosphere
S o
Solar constant
S t
Mean monthly incident total solar radiation
S v
Rate of energy transfer to atmosphere
S bl
Radiative density flux mean
S dt
Daily irradiance
S hd
Daily irradiance outside the atmosphere
S tn
Total solar radiation on cloudy days
S p
Direct solar radiation flux
S t
Total radiative flux
SOM
Soil organic matter
STK
Stokes number
S u i ; S xx ðxÞ Spectral power
S xy ðxÞ
Cospectral power
xx
Acronyms