Zdr for chosen spectral coefficients in 5-7-2004, clear-air, day time, south wind,

insects, clutter.

S.Bachmann

-60 -40 -20 0 20 40 60-50

-40

-30

-20

-10

0

10

20Complex spectrum @23.5 km

HorizontalVertical

Spectrum

oneoneelevation scanelevation scan

az

N = 1..360

IQ

Radial 1

Radial N

Radial az

Zdr

128 pulses

- - Horizontal Vertical

H V

-60 -40 -20 0 20 40 60-50

-40

-30

-20

-10

0

10

20Complex spectrum @23.5 km

HorizontalVertical

Spectrum

oneoneelevation scanelevation scan

az

N = 1..360

IQ

Radial 1

Radial N

Radial az

Zdr

128 pulses

- - Horizontal Vertical

H V

Get rid of DC

I 'Q'

M

i

iii M

III

1

M

i

iii M

QQQ

1

Estimate Spectral CoefSC=f(az, v)

0 50 100 150 200 250 300 35040

50

60

70

80

90

Azimuth, degree

Velo

city,

Spec.

coef.

# Center of the "Hump" of Spectral Coefficients

header

Center of Spectral Coef.

GCF

Window

Spectral observation

Window

-60 -40 -20 0 20 40 60-50

-40

-30

-20

-10

0

10

20Complex spectrum @23.5 km

HorizontalVertical

Spectrum

oneoneelevation scanelevation scan

az

N = 1..360

IQ

Radial 1

Radial N

Radial az

Zdr

128 pulses

- - Horizontal Vertical

H V

Get rid of DC

I 'Q'

M

i

iii M

III

1

M

i

iii M

QQQ

1

Estimate Spectral CoefSC=f(az, v)

0 50 100 150 200 250 300 35040

50

60

70

80

90

Azimuth, degree

Velo

city,

Spec.

coef.

# Center of the "Hump" of Spectral Coefficients

header

Center of Spectral Coef.

GCF

Window

v, h)

2 4 6 8 10 12 14 160

0.25

.5

.75

1

1.25

1.5

1.75

2

2.25

2.5

2.75

Velocity, m s-1

Hei

ght,

km

Sounding: Norman 12Z 7 May

wind velocityrelh, %/10mixr, g/kg

0 20 40 60 80 100 1200

0.5

1

1.5

2

2.5

3

Spectral Coefficient #

Hei

ght,

km

Center of Spec.Coef. corresponding to max velocity

Spectral observation

Sounding

Zdr

for the original spectrum (all 128 pulses included in calculations)

for the chosen spectral window (21 pulses), s.t.

the center of spectral window assumes sin- azimuthal dependence

for the chosen spectral window (21 pulses), s.t.

the center is chosen in agreement with azimuthal and height dependence from sounding.

0.5°

1.5°

2.5°

all 128 pulses window 21 pulses original GSf GSf, DCf, f(h) GSf, DCf

sounding gives v@h. High Zdr vanish at second layer (circled) - birds

128, GSf window, GSf, DCf, f(h) window, GSf, DCf

0 20 40 60 80 100 120-40

-30

-20

-10

0

Spectra: range gates 110 - 250

0 50 100 150 200 250 300 350 400 450-10

-5

0

5

10

15

Zdr

, Fdp

(rad.) and phv

(x10) for points [40:55]

Zdr

Fdp

|rhv

|0 20 40 60 80 100 120

-40

-30

-20

-10

0

Spectra: range gates 110 - 250

0 50 100 150 200 250 300 350 400 450-10

-5

0

5

10

15

Zdr

, Fdp

(rad.) and phv

(x10) for points [40:55]

Zdr

Fdp

|rhv

|0 20 40 60 80 100 120-40

-30

-20

-10

0

Spectra: range gates 110 - 250

0 50 100 150 200 250 300 350 400 450-10

-5

0

5

10

15

Zdr

, Fdp

(rad.) and phv

(x10) for points [40:55]

Zdr

Fdp

|rhv

|

4.5°

2.5°

1.5°

0 20 40 60 80 100 120-40

-30

-20

-10

0

Spectra: range gates 110 - 250

0 50 100 150 200 250 300 350 400 450-10

-5

0

5

10

15

Zdr

, Fdp

(rad.) and phv

(x10) for points [40:55]

Zdr

Fdp

|rhv

|

0.5°

GCf, DCfWindow(40-55)

180°

0 50 100 150 200 250 300 350 400 450-20

-15

-10

-5

0

5

10

15

207-pt. av., no GC: radial 000o, cut 2

Zdr1..128

Zdr40..55

Fdp1..128

-5

Fdp40..55

-5

Rhv1..128

x10+5

Rhv40..55

x10+5

0 32 64 96 128-30

-25

-20

-15

-10

-5

0Spectrum @ gate 140, radial 0o, el. 1.5o

0 32 64 96 128-30

-25

-20

-15

-10

-5

0

Pulse #

HV

HV

Spectrum @ gate 168, radial 0o, el. 1.5o

Zdr window < Zdr 128

0 50 100 150 200 250 300 350 400 450-20

-15

-10

-5

0

5

10

15

207-pt. av., no GC: radial 180o, cut 2

Zdr1..128

Zdr40..55

Fdp1..128

-5

Fdp40..55

-5

Rhv1..128

x10+5

Rhv40..55

x10+5

more Birds/insects/both? If Zdr birds (-1..4), insects (0..10)

75..95

75..95

0 50 100 150 200 250 300 350 400 450

-20

-15

-10

-5

0

5

10

15

207-pt. av., no GC: radial 180o, cut 2

Zdr1..128

Zdr40..55

Fdp1..128

-5

Fdp40..55

-5

Rhv1..128

x10+5

Rhv40..55

x10+5

from Ryzhkov: Biological scatterers in atmosphere

Insects Birds

Z (dBZ)

5 – 20 5 – 30

ZDR

(dB) 0 – 12 -2 – 3

ρhv 0.5 – 0.8

δ (°)0 – 120

0 – 40

KDP (°/km) Low & noisy

1

0.5

0

ρhv

0

δ