CIRAS-3 Operation Manual V. 1.09
129
ΦNO
calculated – non-photochemical quenching due to aggregate constitutive non-regulatory
processes, lake antenna model, requires F
o
Ꞌ
(Kramer calculation)
ΦNPQ-K
calculated – non-photochemical quenching due to down-regulatory (pH, xanthophyll)
processes, lake antenna model, requires F
o
Ꞌ
(Kramer calculation)
Φf,D
calculated – non-photochemical quenching due to aggregate constitutive non-regulatory
processes, equally applicable to puddle and antenna models (Genty calculation)
ΦNPQ-G
calculated – non-photochemical quenching due to down-regulatory (pH, xanthophyll)
processes, equally applicable to puddle and antenna models (Genty calculation)
Calculations Used for Chlorophyll Fluorescence Parameters
Parameter Calculation
F
v
F
v
=
𝑭
𝒎
− 𝑭
𝒐
F
v
/F
m
F
v
/F
m
=
(
𝑭
𝒎
−𝑭
𝒐
)
𝑭
𝒎
ϕ
PSII
ϕ
PSII
=
(
𝑭
𝒎′
−𝑭
𝒔
)
𝑭
𝒎
′
F
o
′
F
o
′
=
𝑭
𝒐
�
𝑭𝒗
𝑭𝒎
�
+
�
𝑭𝒐
𝑭𝒎′
�
F
v
ꞌ
F
v
ꞌ =
𝑭
𝒎
′ − 𝑭
𝒐
′
F
v
ꞌ/F
m
ꞌ
F
v
ꞌ/F
m
ꞌ =
(
𝑭
𝒎
′−𝑭
𝒐
′
)
𝑭
𝒎
′
J
J =
(
𝑰 ∙ 𝜶 ∙ 𝐟
𝐈𝐈
∙ 𝚽
𝑷𝑷𝑰𝑰
)
Note:
α
=average fraction of irradiance,
I (
as PAR
)
, absorbed by leaf, default value of
α
=0.84;
f
II
=fraction of
α
absorbed by PSII, default value of
f
II
=0.5
q
p
q
p
=
(
𝑭
𝒎
′− 𝑭
𝒔
)
(
𝑭
𝒎
′−𝑭
𝒐
′
)
q
NP
q
NP
=
(
𝑭
𝒎
−𝑭
𝒎
′
)
(
𝑭
𝒎
−𝑭
𝒐
′
)
NPQ
NPQ =
(
𝑭
𝒎
−𝑭
𝒎
′
)
𝑭
𝒎
′
q
L
q
L
=
��
𝑭
𝒎
′−𝑭
𝒔
𝑭
𝒎
′−𝑭
𝒐
′
� ∙
𝑭
𝒐
′
𝑭
𝒔
�
=
𝒒
𝒑
∙
𝑭
𝒐
′
𝑭
𝒔
