Table 1.

Abbreviation list.

Abbreviation	Description	Unit
C A-1leaf	leaf heat capacity per unit area	J m-2 K-1
cp	specific heat capacity at constant pressure	J kg-1 K-1
d	characteristic leaf geometry	m
gH	boundary layer conductance to convective heat	m s-1
gLW	boundary layer conductance to radiative heat	m s-1
Gr	Grashof number
gs	stomatal conductance	m s-1 or mol m-2 s-1
H	convective heat flux density	W m-2
hH	convective heat transfer coefficient	W m-2 K-1
hleaf	leaf heat transfer coefficient	W m-2 K-1
hLW	long-waver radiative heat transfer coefficient	W m-2 K-1
hλE	evapotranspirative heat transfer coefficient	W m-2 K-1
k	thermal conductivity of air	W m-1 K-1
LW	long-wave radiative heat flux density	W m-2
LWC	leaf succulence/leaf water content per unit area	mg cm-2
Nu	Nusselt number
raW	boundary layer resistance to water vapor	s m-1
Re	Reynolds number
rH	boundary layer resistance to convective heat	s m-1
rs	stomatal resistance	s m-1 or m² s mol-1
rW	leaf resistance to water vapor (raW + rs)	s m-1
s	slope relating saturation vapor pressure to temperature	Pa K-1
t0.5	time which is required to reach 50% of the initial value in an exponential decay	s
Ta	ambient air temperature	°C or K
TL	steady state leaf temperature	°C or K
T’L	non-steady state leaf temperature	°C or K
TL-Ta	difference leaf temperature to ambient air temperature	°C or K
u0.5	wind speed at which τ has decreased to 50% of its initial value	m s-1
γ	psychrometer constant	Pa K-1
ϵ	emissivity
λE	evapotranspiration	W m-2
ρa	density of air at constant pressure	kg m-3
τ	time constant	s
Φin	incoming radiation (solar radiation + thermal radiation)	W m-2