Long-term variabilities and tendencies in zonal mean TIMED–SABER ozone and temperature in the middle atmosphere at 10–15°N

Nath, Oindrila; Sridharan, S.

doi:10.1016/j.jastp.2014.08.010

Cited by 25 publications

(32 citation statements)

References 42 publications

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“…In the left plot (a) of Fig. 5, from 20 to 50 km, our ozone results agree very well with those of Nath and Sridharan (2014), especially considering that their analysis covers 10 to 15 • latitude, while our responses are for 12 • latitude. From 50 to 80 km, the agreement still appears to be good, both with near-zero values.…”

Section: Comparison With Previous Saber Analysissupporting

confidence: 84%

“…We believe that the differences between our results and those by Nath and Sridharan (2014), especially at higher altitudes for both ozone and temperature, are due to the local time variations that are in the SABER data, as discussed in Sect. 2.1 (Data characteristics).…”

Section: Comparison With Previous Saber Analysiscontrasting

confidence: 69%

“…However, a caveat is that in this region the ozone mixing ratios are relatively very small, so on the scale plotted, variations and differences would not show up well, because they are not plotted as percent differences, as in previous figures, but in units of ppmv. The choice of units is to conform with Nath and Sridharan (2014). Above ∼ 80 km, our responses are systematically smaller.…”

Section: Comparison With Previous Saber Analysismentioning

confidence: 96%

“…Studies by others using SABER temperature (diurnal tides) include Zhang et al (2006) and Mukhtarov et al (2009). Nath and Sridharan (2014) have also derived results of response to solar variability using SABER data at 10-15 • latitude (see Sect. 4.2).…”

Section: Data Characteristics and Analysismentioning

confidence: 99%

“…As noted earlier, Nath and Sridharan (2014) have derived responses to solar variability, also based on SABER data, but only at 10-15 • latitude. Comparisons should help in analyzing the quality of the results.…”

Section: Comparison With Previous Saber Analysismentioning

confidence: 99%

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Ozone and temperature decadal responses to solar variability in the mesosphere and lower thermosphere, based on measurements from SABER on TIMED

et al. 2016

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Abstract. We have derived ozone and temperature responses to solar variability over a solar cycle, from June 2002 through June 2014, 50 to 100 km, 48 • S to 48 • N, based on data from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on the ThermosphereIonosphere-Mesosphere-Energetics and Dynamics (TIMED) satellite. Results with this extent of coverage in the mesosphere and lower thermosphere have not been available previously. A multiple regression is applied to obtain responses as a function of the solar 10.7 cm flux (solar flux units, sfu). Positive responses mean that they are larger at solar maximum than at solar minimum of the solar cycle. From ∼ 80 to 100 km, both ozone and temperature responses are positive for all latitudes and are larger than those at lower altitudes. From ∼ 80 to 100 km, ozone responses can exceed 10 % (100 sfu) −1 , and temperature responses can approach 4 • K. From 50 to ∼ 80 km, the ozone responses at low latitudes (∼ ±35 • ) are mostly negative and can approach ∼ negative 3 % (100 sfu) −1 . However, they are mostly positive at midlatitudes in this region and can approach ∼ 2 % (100 sfu) −1 . In contrast to ozone, from ∼ 50 to 80 km, the temperature responses at low latitudes remain positive, with values up to ∼ 2.5 K (100 sfu) −1 , but are weakly negative at midlatitudes. Consequently, there is a systematic and robust relation between the phases of the ozone and temperature responses. They are positively correlated (in phase) from ∼ 80 to 100 km for all latitudes and negatively correlated (out of phase) from ∼ 50 to 80 km, also for all latitudes. The negative correlation from 50 to 80 km is maintained even though the ozone and temperature responses can change signs as a function of altitude and latitude, because the corresponding temperature responses change signs in step with ozone. This is consistent with the idea that dynamics have the larger influence between ∼ 80 and 100 km, while photochemistry is more in control from ∼ 50 to 75 km. The correlation coefficients between the solar 10.7 cm flux and the ozone and temperature themselves from 2012 to 2014 are positive (negative) in regions where the responses are positive (negative). This supports our results since the correlations are independent of the multiple regression used to derive the responses. We also compare with previous results.

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Section: Comparison With Previous Saber Analysissupporting

confidence: 84%

Section: Comparison With Previous Saber Analysiscontrasting

confidence: 69%

Section: Comparison With Previous Saber Analysismentioning

confidence: 96%

Section: Data Characteristics and Analysismentioning

confidence: 99%

Section: Comparison With Previous Saber Analysismentioning

confidence: 99%

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Ozone and temperature decadal responses to solar variability in the mesosphere and lower thermosphere, based on measurements from SABER on TIMED

et al. 2016

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The response of the temperature of cold‐point mesopause to solar activity based on SABER data set

et al. 2016

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The thermal structure and energy balance of upper atmosphere are dominated by solar activity. The response of cold‐point mesopause (CPM) to solar activity is an important form. This article presents the response of the temperature of CPM (T‐CPM) to solar activity using 14 year Sounding of the Atmosphere using Broadband Emission Radiometry data series over 80°S–80°N regions. These regions are divided into 16 latitude zones with 10° interval, and the spatial areas of 80°S–80°N, 180°W–180°E are divided into 96 lattices with 10°(latitude) × 60°(longitude) grid. The annual‐mean values of T‐CPM and F10.7 are calculated. The least squares regression method and correlation analysis are applied to these annual‐mean series. First, the results show that the global T‐CPM is significantly correlated to solar activity at the 0.05 level of significance with correlation coefficient of 0.90. The global solar response of T‐CPM is 4.89 ± 0.67 K/100 solar flux unit. Then, for each latitude zone, the solar response of T‐CPM and its fluctuation are obtained. The solar response of T‐CPM becomes stronger with increasing latitude. The fluctuation ranges of solar response at middle‐latitude regions are smaller than those of the equator and high‐latitude regions, and the global distribution takes on W shape. The corelationship analysis shows that the T‐CPM is significantly correlated to solar activity at the 0.05 level of significance for each latitude zone. The correlation coefficients at middle‐latitude regions are higher than those of the equator and high‐latitude regions, and the global distribution takes on M shape. At last, for each grid cell, the response of T‐CPM to solar activity and their correlation coefficient are presented.

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Temperature responses to the 11 year solar cycle in the mesosphere from the 31 year (1979–2010) extended Canadian Middle Atmosphere Model simulations and a comparison with the 14 year (2002–2015) TIMED/SABER observations

Gan

Fomichev

et al. 2017

JGR Space Physics

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A recent 31 year simulation (1979–2010) by extended Canadian Middle Atmosphere Model (eCMAM30) and the 14 year (2002–2015) observation by the Thermosphere Ionosphere Mesosphere and Dynamics/Sounding of the Atmosphere using Broadband Emssion Radiometry (TIMED/SABER) are utilized to investigate the temperature response to the 11 year solar cycle on the mesosphere. Overall, the zonal mean responses tend to increase with height, and the amplitudes are on the order of 1–2 K/100 solar flux unit (1 sfu = 10−22 W m−2 Hz−1) below 80 km and 2–4 K/100 sfu in the mesopause region (80–100 km) from the eCMAM30, comparatively weaker than those from the SABER except in the midlatitude lower mesosphere. A pretty good consistence takes place at around 75–80 km with a response of ~1.5 K/100 sfu within 10°S/N. Also, a symmetric pattern of the responses about the equator agrees reasonably well between the two. It is noteworthy that the eCMAM30 displays an alternate structure with the upper stratospheric cooling and the lower mesospheric warming at midlatitudes of the winter hemisphere, in favor of the long‐term Rayleigh lidar observation reported by the previous studies. Through diagnosing multiple dynamical parameters, it is manifested that this localized feature is induced by the anomalous residual circulation as a consequence of the wave‐mean flow interaction during the solar maximum year.

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Long-term variabilities and tendencies in zonal mean TIMED–SABER ozone and temperature in the middle atmosphere at 10–15°N

Cited by 25 publications

References 42 publications

Ozone and temperature decadal responses to solar variability in the mesosphere and lower thermosphere, based on measurements from SABER on TIMED

Ozone and temperature decadal responses to solar variability in the mesosphere and lower thermosphere, based on measurements from SABER on TIMED

The response of the temperature of cold‐point mesopause to solar activity based on SABER data set

Temperature responses to the 11 year solar cycle in the mesosphere from the 31 year (1979–2010) extended Canadian Middle Atmosphere Model simulations and a comparison with the 14 year (2002–2015) TIMED/SABER observations

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