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#Metview Macro
# **************************** LICENSE START ***********************************
#
# Copyright 2020 ECMWF. This software is distributed under the terms
# of the Apache License version 2.0. In applying this license, ECMWF does not
# waive the privileges and immunities granted to it by virtue of its status as
# an Intergovernmental Organization or submit itself to any jurisdiction.
#
# ***************************** LICENSE END ************************************
#
# get data
use_mars = 0 # 0 or 1
if use_mars then
# retrieve data from MARS
ret_core = (
date : 20200822,
time : 0,
area : [40,-93,51,-84],
grid : [0.5,0.5]
)
# forecast fields on all the model levels (bottom=ML-137, top=ML-1)
# Note: log surface pressure (lnsp) is defined on ML-1!
fs_ml = retrieve(ret_core,
type: "fc",
levtype: "ml",
levelist: [1, "TO", 137],
step: 12,
param: ["t", "q", "lnsp"])
# surface geopotential is available in
# the analysis only! It is available on ML-1!
zs = retrieve(ret_core,
type: "an",
levtype: "ml",
levelist: 1,
param: "z")
else
# read data from GRIB file
fs_ml = read("xs_ml_orog.grib")
zs = read(data: fs_ml, param: "z")
end if
# extract ml data
t = read(data: fs_ml, param: "t")
q = read(data: fs_ml, param: "q")
lnsp = read(data: fs_ml, param: "lnsp")
# compute geopotential on model levels
z = mvl_geopotential_on_ml(t, q, lnsp, zs)
# define cross section line
line = [50.21,-91.82,40.82,-84.71]
# define bottom level (m)
bottom_level = 0
# extract a set of levels needed for the cross section
# and converts temperature from K to C
t = read(data: t, levelist:[137,"TO", 100]) - 273.16
z = read(data: z, levelist:[137,"TO", 100])
# compute cross section in height (above sea level) for t
# (using z, paramId=129)
xs_t = mcross_sect(
data: t & z/9.81,
line: line,
vertical_coordinates: "user",
vertical_coordinate_param: 129,
vertical_coordinate_extrapolate: "on"
)
# generate orography area curve
orog_curve = xs_build_orog(xs_t, zs/9.81, bottom_level, "charcoal")
# define contour shading for temperature
cont = mcont(
legend : "on",
contour_line_colour : "charcoal",
contour_highlight : "off",
contour_level_selection_type : "interval",
contour_max_level : 23.5,
contour_min_level : 16.5,
contour_interval : 0.5,
contour_shade : "on",
contour_shade_method : "area_fill",
contour_shade_max_level_colour : "red",
contour_shade_min_level_colour : "green",
contour_shade_colour_direction : "clockwise"
)
# define vertical axis
vertical_axis = maxis(
axis_orientation : "vertical",
axis_title_text : "Height ASL (m)",
axis_tick_label_height: 0.4
)
# define cross section in height above sea level (m)
xs_view = mxsectview(
line : line,
top_level : 1000,
bottom_level: bottom_level,
vertical_axis: vertical_axis
)
# define legend
legend = mlegend(
legend_text_font_size : 0.35
)
# define title
title = mtext(
text_font_size : 0.4
)
# define the output plot file
setoutput(pdf_output(output_name : 'cross_section_height_ml_orog'))
# generate plot
plot(xs_view,
xs_t, cont,
orog_curve, legend, title) |
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"""
Cross Section in Height for Model Level Data with Orography
"""
# Metview Macro
# **************************** LICENSE START ***********************************
#
# Copyright 2020 ECMWF. This software is distributed under the terms
# of the Apache License version 2.0. In applying this license, ECMWF does not
# waive the privileges and immunities granted to it by virtue of its status as
# an Intergovernmental Organization or submit itself to any jurisdiction.
#
# ***************************** LICENSE END ************************************
#
import metview as mv
# get data
use_mars = False
if use_mars:
# retrieve data from MARS
ret_core = {
"date": 20200822,
"time": 0,
"area": [40, -93, 51, -84],
"grid": [0.5, 0.5],
}
# forecast fields on all the model levels (bottom=ML-137, top=ML-1)
# Note= log surface pressure (lnsp) is defined on ML-1!
fs_ml = mv.retrieve(
**ret_core,
type="fc",
levtype="ml",
levelist=[1, "TO", 137],
step=12,
param=["t", "q", "lnsp"]
)
# surface geopotential is available in
# the analysis only! It is available on ML-1!
zs = mv.retrieve(**ret_core, type="an", levtype="ml", levelist=1, param="z")
else:
# read data from GRIB file
fs_ml = mv.read("xs_ml_orog.grib")
zs = mv.read(data=fs_ml, param="z")
# extract ml data
t = mv.read(data=fs_ml, param="t")
q = mv.read(data=fs_ml, param="q")
lnsp = mv.read(data=fs_ml, param="lnsp")
# compute geopotential on model levels
z = mv.mvl_geopotential_on_ml(t, q, lnsp, zs)
# define cross section line
line = [50.21, -91.82, 40.82, -84.71]
# define bottom level (m)
bottom_level = 0
# extract a set of levels needed for the cross section
# and converts temperature from K to C and z to m
t = mv.read(data=t, levelist=[137, "TO", 100]) - 273.16
z = mv.read(data=z, levelist=[137, "TO", 100]) / 9.81
# compute cross section in height (above sea level) for t
# (using z, paramId=129)
xs_t = mv.mcross_sect(
data=mv.merge(t, z),
line=line,
vertical_coordinates="user",
vertical_coordinate_param=129,
vertical_coordinate_extrapolate="on",
)
# generate orography area curve
orog_curve = mv.xs_build_orog(xs_t, zs / 9.81, bottom_level, "charcoal")
# define contour shading for temperature
cont = mv.mcont(
legend="on",
contour_line_colour="charcoal",
contour_highlight="off",
contour_level_selection_type="interval",
contour_max_level=23.5,
contour_min_level=16.5,
contour_interval=0.5,
contour_shade="on",
contour_shade_method="area_fill",
contour_shade_max_level_colour="red",
contour_shade_min_level_colour="green",
contour_shade_colour_direction="clockwise",
)
# define vertical axis
vertical_axis = mv.maxis(
axis_orientation="vertical",
axis_title_text="Height ASL (m)",
axis_tick_label_height=0.4,
)
# define cross section in height above sea level (m)
xs_view = mv.mxsectview(
line=line, top_level=1000, bottom_level=bottom_level, vertical_axis=vertical_axis
)
# define legend
legend = mv.mlegend(legend_text_font_size=0.35)
# define title
title = mv.mtext(text_font_size=0.4)
# define the output plot file
mv.setoutput(mv.pdf_output(output_name="cross_section_height_ml_orog"))
# generate plot
mv.plot(xs_view, xs_t, cont, orog_curve, legend, title)
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