diff --git a/Project.toml b/Project.toml
index f258a19d..4cf5398d 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "CLIMAParameters"
 uuid = "6eacf6c3-8458-43b9-ae03-caf5306d3d53"
 authors = ["Climate Modeling Alliance"]
-version = "0.9.0"
+version = "0.9.1"
 
 [deps]
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
diff --git a/src/parameters.toml b/src/parameters.toml
index df6d04e4..30b24534 100644
--- a/src/parameters.toml
+++ b/src/parameters.toml
@@ -1179,6 +1179,23 @@ value = -10.66873
 type = "float"
 description = "Coefficient, c, for calculating immersion freezing J_het of Illite [-]. From Knopf and Alpert 2013. DOI: 10.1039/C3FD00035D."
 
+# Microphysics - P3 ice nucleation paramerizations
+
+[Thompson2004_T_threshold_Cooper]
+value = 233
+type = "float"
+description = "Cutoff temperature, T_thres, below which the P3 deposition parameterization is determined at T_thres [K]. From Thompson et al 2004. DOI: 10.1175/1520-0493(2004)132<0519:EFOWPU>2.0.CO;2."
+
+[BarklieGokhale1959_a_parameter]
+value = 0.65
+type = "float"
+description = "Mean of parameter a for determining P3 heterogeneous freezing [°C^-1]. From Barklie & Gokhale 1959. No DOI. See Pruppacher & Klett 1997 pg 350."
+
+[BarklieGokhale1959_B_parameter]
+value = 2e-4
+type = "float"
+description = "Parameter, B, for rain water. Used to determine P3 heterogeneous freezing. [cm^-3 s^-1]. From Barklie & Gokhale 1959. No DOI. See Pruppacher & Klett 1997 pg 350."
+
 # Microphysics - temperature dependant, aerosol independant immerson freezing
 
 [Frostenberg2023_standard_deviation]