def compute_afternoon_vpd(self) :
bufs = self.get_buffer_group()
t = bufs.get('Tair').ref_val()
q = bufs.get('Qair').ref_val()
p = bufs.get('PSurf').ref_val()
vp_act = met.calc_vp_spec_humidity(q,p)
return met.calc_vpd(t,vp_act)
def compute_afternoon_vpd(self):
bufs = self.get_buffer_group()
t = bufs.get('Tair').ref_val()
q = bufs.get('Qair').ref_val()
p = bufs.get('PSurf').ref_val()
vp_act = met.calc_vp_spec_humidity(q, p)
return met.calc_vpd(t, vp_act)
def test_vp_spec_humidity(self) :
"""Tests specific humidity -> vapor pressure calculation
Calculates specific humidity using eqn 2.19 of [1], then
tests to ensure the tested function can calculate the original
vapor pressure used.
[1] Rogers, R. R. A Short Course in Cloud Physics, Third Edition.
3 edition. Oxford ; New York: Pergamon, 1989.
"""
# atmospheric variables used in specific humidity calc.
e = 611 * u.Pa # vapor pressure
p = 1 * u.bar # total pressure
# calculate specific humidity
q = m.EPSILON * (e/(p - (1-m.EPSILON)*e))
e_test = m.calc_vp_spec_humidity(q,p)
self.assertTrue(np.abs(e-e_test)<0.1 * u.Pa)
def test_vp_spec_humidity(self):
"""Tests specific humidity -> vapor pressure calculation
Calculates specific humidity using eqn 2.19 of [1], then
tests to ensure the tested function can calculate the original
vapor pressure used.
[1] Rogers, R. R. A Short Course in Cloud Physics, Third Edition.
3 edition. Oxford ; New York: Pergamon, 1989.
"""
# atmospheric variables used in specific humidity calc.
e = 611 * u.Pa # vapor pressure
p = 1 * u.bar # total pressure
# calculate specific humidity
q = m.EPSILON * (e / (p - (1 - m.EPSILON) * e))
e_test = m.calc_vp_spec_humidity(q, p)
self.assertTrue(np.abs(e - e_test) < 0.1 * u.Pa)