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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 : 20200723,
time : 0,
area : [-8,25,-25,55],
grid : [0.2,0.2]
)
# 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", "u", "v", "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")
# boundary layer height forecast
blh = retrieve(ret_core,
type: "fc",
levtype: "sfc",
param: "blh",
step: 12)
else
# read data from GRIB file
fs_in = read("xs_blh.grib")
fs_ml = read(data: fs_in, levtype: "ml")
zs = read(data: fs_ml, param: "z")
blh = read(data: fs_in, param: "blh")
end if
# extract ml data
t = read(data: fs_ml, param: "t")
q = read(data: fs_ml, param: "q")
lnsp = read(data_ml: fs_ml, param: "lnsp")
u = read(data: fs_ml, param: "u")
v = read(data: fs_ml, param: "v")
# define cross section line
line = [-10,28,-21,52]
# -------------------------------------------
# Generate cross section data for wind speed
# -------------------------------------------
# compute wind speed and set its paramId
sp = sqrt(u*u + v*v)
sp = grib_set_long(sp, ["paramId", 10])
# compute cross section data for sp
# (this is a NetCDF object)
xs_sp = mcross_sect(data: sp & lnsp, line: line)
# -------------------------------------------
# Generate curve for BL height
# -------------------------------------------
# compute geopotential on model levels
z = mvl_geopotential_on_ml(t, q, lnsp, zs)
# compute pressure on model levels
p = unipressure(lnsp)
# interpolate pressure to the height of the BL
p_blh = ml_to_hl(p, z, zs, blh, "ground", "linear")
# define a curve object (in hPa) for the pressure of BL height
p_blh_curve = xs_build_curve(xs_sp, p_blh/100, "red", "solid", 3)
# define shading for wind speed using a palette
sp_cont = mcont(
legend : "on",
contour_line_colour : "charcoal",
contour_highlight : "off",
contour_level_selection_type : "interval",
contour_max_level : 18,
contour_min_level : 0,
contour_interval : 2,
contour_shade : "on",
contour_shade_colour_method : "palette",
contour_shade_method : "area_fill",
contour_shade_palette_name : "m_purple_9"
)
# define vertical axis
vertical_axis = maxis(
axis_orientation : "vertical",
axis_type : "position_list",
axis_tick_position_list : [1000, 925, 850, 700, 600, 500],
axis_tick_label_height: 0.4
)
# define cross section in log pressure (hPa)
xs_view = mxsectview(
line : line,
top_level : 500,
bottom_level: 1030,
vertical_scaling : "log",
vertical_axis: vertical_axis
)
# define orography area shading
orog_graph = mgraph(
graph_type : "area",
graph_shade_colour : "charcoal"
)
# 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_orog_and_blh'))
# generate plot
plot(xs_view,
xs_sp, sp_cont,
orog_graph,
p_blh_curve,
legend, title)
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"""
Cross Section with Orography and Boundary Layer Height
=======================================================
"""
# **************************** 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:
# get data from MARS
ret_core = {"date": "20200723", "time": 0, "area": [-8, 25, -25, 55], "grid": [0.2, 0.2]}
# 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", "u", "v", "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")
# boundary layer height forecast
blh = mv.retrieve(**ret_core, type="fc", levtype="sfc", param="blh", step=12)
else:
# read data from GRIB file
fs_in = mv.read("xs_blh.grib")
fs_ml = mv.read(data=fs_in, levtype="ml")
zs = mv.read(data=fs_ml, param="z")
blh = mv.read(data=fs_in, param="blh")
# extract ml data
t = mv.read(data=fs_ml, param="t")
q = mv.read(data=fs_ml, param="q")
lnsp = mv.read(data_ml=fs_ml, param="lnsp")
u = mv.read(data=fs_ml, param="u")
v = mv.read(data=fs_ml, param="v")
# define cross section line
line = [-10, 28, -21, 52]
# -------------------------------------------
# Generate cross section data for wind speed
# -------------------------------------------
# compute wind speed and set its paramId
sp = mv.sqrt(u * u + v * v)
sp = mv.grib_set_long(sp, ["paramId", 10])
# compute cross section data for sp
# (this is a NetCDF object)
sp_fs = sp
sp_fs.append(lnsp)
xs_sp = mv.mcross_sect(data=sp_fs, line=line)
# -------------------------------------------
# Generate curve for BL height
# -------------------------------------------
# compute geopotential on model levels
z = mv.mvl_geopotential_on_ml(t, q, lnsp, zs)
# compute pressure on model levels
p = mv.unipressure(lnsp)
# interpolate pressure to the height of the BL
p_blh = mv.ml_to_hl(p, z, zs, blh, "ground", "linear")
# define a curve object (in hPa) for the pressure of BL height
p_blh_curve = mv.xs_build_curve(xs_sp, p_blh/100, "red", "solid", 3)
# define shading for wind speed using a palette
sp_cont = mv.mcont(
legend="on",
contour_line_colour="charcoal",
contour_highlight="off",
contour_level_selection_type="interval",
contour_max_level=18,
contour_min_level=0,
contour_interval=2,
contour_shade="on",
contour_shade_colour_method="palette",
contour_shade_method="area_fill",
contour_shade_palette_name="m_purple_9",
)
# define vertical axis
vertical_axis = mv.maxis(
axis_orientation="vertical",
axis_type="position_list",
axis_tick_position_list=[1000, 925, 850, 700, 600, 500],
axis_tick_label_height=0.4,
)
# define cross section in log pressure (hPa)
xs_view = mv.mxsectview(
line=line,
top_level=500,
bottom_level=1030,
vertical_scaling="log",
vertical_axis=vertical_axis,
)
# define orography area shading
orog_graph = mv.mgraph(graph_type="area", graph_shade_colour="charcoal")
# 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_orog_and_blh"))
# generate plot
mv.plot(xs_view, xs_sp, sp_cont, orog_graph, p_blh_curve, legend, title)
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