MODULASI QBO TERHADAP ANOMALI KONSENTRASI UAP AIR DAN OZON DI STRATOSFER BAWAH

Noersomadi Noersomadi

Abstract


Angin rerata zonal di stratosfer bawah (100–10 hPa) yang merambat vertikal ke bawah seiring waktu dengan periode ~26 bulanan lazim disebut sebagai Quasi Biennial Oscillation (QBO). Untuk mengetahui hubungan antara QBO dengan konsentrasi uap air (H2O) dan ozon (O3) terhadap proses pendinginan dan pemanasan radiatif di stratosfer bawah, penelitian ini menggunakan data MLS Aura versi 4.2 sepanjang Agustus 2004–Juli 2019 (16 tahun). Kami menitikberatkan pada analisis variasi antartahunan yaitu simpangan dari rerata tahunan anomali H2O (H2O*) dan anomali (O3*). H2O* menunjukkan pola perambatan ke atas yang dikenal sebagai ‘atmospheric tape recorder’. Osilasi O3* positif–negatif dan anomali temperatur (T*) hangat–dingin terlihat jelas merambat ke bawah bersesuaian dengan pola perubahan angin zonal. Diagram komposit H2O* di 100 hPa menunjukkan anomali kering sekitar ± 3 bulan dari transisi fasa QBO timuran (QBO easterly; QBO-E) ke fasa QBO baratan (QBO westerly; QBO-W), dimana O3* memerlihatkan fluktasi menurun dan meningkat di 20–50 hPa. Udara kering (H2O* ~ –0.5 ppmv) dengan O3* positif (0.5 ppmv) tinggi akan menaikkan temperatur sebesar 2 K. Profil rerata H2O*, O3* dan T* pada dua fasa QBO yang berbeda menunjukkan modulasi QBO pada variasi uap air dan ozon yang memengaruhi pendinginan dan pemanasan radiatif di stratosfer bawah. Dengan demikian, variasi dua komposisi kimia (H2O dan O3) terkait respon radiatif di stratosfer bawah perlu dipertimbangkan untuk pengembangan model iklim.


Keywords


QBO, uap air, ozon, stratosfer bawah

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DOI: http://dx.doi.org/10.31172/jmg.v21i2.672

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