Comparison of average monthly LIDAR temperature profiles with average monthly

TRRNSMISSION

7.9 Comparison of average monthly LIDAR temperature profiles with average monthly

ECMWF temperature profiles

The average monthly LIDAR temperature profile is compared with the aver- age monthly ECMWF temperatureprofile over the altitude range 20 and 48 km for the years 1999 and 2000. The results are shown in figs.(7.14)-(7.18).

As can be seen from the figures, the agreement between LIDAR and ECMWFisgood below 30 km. Above 30 km the LIDAR temperatureprofiles are warmer for the months of April to July. For the month of July, we have separated the results into July 1999 and July 2000 average LIDAR profiles.

The LIDAR temperature profile is consistently higher in July 2000 than any ot her LIDAR profiles of the year 1999 and 2000. Indeed in July 2000 (see fig.(7.16)) at a height of 43.5 km, the LIDAR temperature is 260 K compare to ECMWF temperature which is 249 K at the same height. This clearly shows a minor warming of the stratosphere. The stratopause height and the

(a)

- L1DAR

50 - SAWS

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- - SAWSstd -.5-

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~ 20

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Temperature(K)

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~

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. a

~ 20

10

0100 2CD 210 22) 2Jl 240 25) 200 270 2ffl 200 3CD

Temperature(K)

Figure 7.9: Comparison of average monthly L1DAR temperature profile with average monthly SAWS radiosonde temperature profile for the months of (a) April (b) May 1999. The L1DAR profile was averaged over 3 nights in April and 11 nights in May. The horizontal dashed line is the tropopause height.

(a) 50

40

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Terrperature(K)

- UDAR

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OL,-.--'---'---'---'---'---"---'---'---'----'---'

1^g) 200 210 2JJ 23J 2'{) 2SJ 2ffJ li aature(K)

Figure 7.10: Comparison of average monthly L1DAR temperature profile with average monthly SAWS radiosonde temperature profile for the months of (a) June (b) July 1999. The L1DAR profile was averaged over 15 nights in June and 15 nights in July. The horizontal dashed line is the tropopause height.

(a)

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0100 200 210 22) 2Jl 2<D 25:> 200 270 200 200 3Ul Terrperature(K)

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100 200 210 22) 2~ 2~ 2~ 200 Terrp erature(K) 10

60 (b) 50

40

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Figure 7.11: Comparison of average monthly L1DAR temperature profilewith average monthly SAWS radiosonde temperature profile for the months of (a) August (b) September 1999. The L1DAR profilewas averaged over 11 nights in August and 7 nights in September. The horizontal dashed line is the tropopause height.

(a)

~oo ²⁰⁰ 2~ 2~ 2~ 2~ 2~ ²⁰⁰

TempEIature(K)

- UDAA

~ SAW3

- - UDAA error

300

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4

1 (b)

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100 200 2~ 2~ 2~ 2~ 2~ 200 2~ 2ffi 200 300

TempEIature(K)

Figure 7.12: (a) Comparison of L1DAR temperature profile with SAWS ra- diosonde temperature profile for 30 October 1999. Due to rainy weather con- ditions in October, there is only one night of L1DAR data. (b) Comparison of average monthly L1DAR temperature profile with average monthly SAWS tem- perature profile for the month of Nov 1999. The L1DAR profile was averaged over 3 nights in Nov. The horizontal dashed line is the tropopause height.

Figure 7.13: Comparison of L1DAR temperature profile with SAWS radiosonde temperature profile for 14 December 1999. Due to rainy weather conditions in Durban, there is only one night of L1DAR data in December. The horizontal dashed line is the tropopause height.

temperature vary during this event.

For the summer period(SeptembertoDecember )the LIDARtemperat ure profiles are slight ly colder than the ECMWF temperat ure profiles especially above 35km. Itshould be noted due to rainy weather conditions in October and December 2000, there is no LIDAR dat a for these two months. Results in 1999 have been shown (figs.(7.17) and (7.18)) . The LIDAR temperat ure profile for the mont h of July is averaged separate ly over the year 1999 and 2000 and is shown in figs.(7.15) (b) and (7.16) (a) respectively. Thereason for doing this is that the wave-like structures seen on the average July 2000 LIDARprofileare morepronounced compare tothoseon theaverageLIDAR June 1999. It has been felt necessar y to separate the twoprofilesin order to preserve the information they carry.

Figure 7.14: Comparison of the average monthly L1DAR temperature profile with average monthly ECMWF temperature profile for the months of (a) April 1999/2000 (b) May 1999/2000. The L1DAR profile was averaged over 7 nights in April and 12 nights in May.

Figure 7.15: Comparison of the average monthly L1DAR temperature profile with average monthlyECMWF temperature profile for the months of (a) June 1999/2000 (b) July 1999. The L1DAR profile was averaged over 30 nights in June and 12 nights in July.

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Figure 7.16: L1DAR temperature profile with average monthly ECMWF temper- ature profile for the months of (a) July 2000 (b) August 1999/2000. The L1DAR profile in (a) was averaged over 12 nights in July and in (b) the L1DAR profile was averaged over 23 nights in August.

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Figure _7.~: (a) Comparison of the average monthly L1DAR temperature pro- file with average monthly ECMWF temperature profile for the month of Sept 1999/2000, The L1DAR profile was averaged over 11 nights in Sept (b) Compar- ison of the L1DAR temperature profile with ECMWF temperature profile for 30 Oct 1999, Due to rainy weather conditions in Oct, there is only 1 L1DAR data,

2~ 2~ 2~ 2~ 2ffi 2~ 2ffi

Terrp 8"ature(K)

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Terrp 8"ature(K)

Figure7.t8-: (a) Comparison of the average monthlyL1DARtemperature profile with average monthly ECMWF temperature profile for the month of Nov. The L1DAR profile was averaged over 4 nights in Nov 1999/2000 (b) Comparison of the L1DAR temperature profile with ECMWF temperature profile for 14Dec 1999. Dueto rainy weather condit ions in Dec,there isonly1 L1DAR dat a.

7.10 Comparison of average monthly LIDAR