Allan, R. ORCID: https://orcid.org/0000-0003-0264-9447 (2021) How and why Earth's climate is changing. In: Weather - A force of nature: Spectacular images from weather photographer of the year. Natural History Museum, London, England, pp. 6-7, pp. 192. ISBN 9780565095253

Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, Hawkins, E. ORCID: https://orcid.org/0000-0001-9477-3677, Bellouin, N. ORCID: https://orcid.org/0000-0003-2109-9559 and Collins, B. ORCID: https://orcid.org/0000-0002-7419-0850 (2021) IPCC, 2021: Summary for Policymakers. In: Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S. L., Péan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., Lonnoy, E., Matthews, J. B. R., Maycock, T. K., Waterfield, T., Yelekçi, O., Yu, R. and Zhou, B. (eds.) Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, pp. 1-2. doi: https://doi.org/10.1017/9781009157896.001

Amezcua, J. and Barton, Z. (2021) Assimilating atmospheric infrasound data to constrain atmospheric winds in a two-dimensional grid. Quarterly Journal of the Royal Meteorological Society, 147 (740). pp. 3530-3554. ISSN 1477-870X doi: https://doi.org/10.1002/qj.4141

Arias, P. A., Bellouin, N. ORCID: https://orcid.org/0000-0003-2109-9559, Coppola, E., Jones, R. G., Krinner, G., Marotzke, J., Naik, V., Palmer, M. D., Plattner, G.-K., Rogelj, J., Rojas, M., Sillmann, J., Storelvmo, T., Thorne, P. W., Trewin, B., Rao, K. A., Adhikary, B., Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, Armour, K., Bala, G., Barimalala, R., Berger, S., Canadell, J. G., Cassou, C., Cherchi, A., Collins, W. ORCID: https://orcid.org/0000-0002-7419-0850, Collins, W. D., Connors, S. L., Corti, S., Cruz, F., Dentener, F. J., Dereczynski, C., Luca, A. D., Niang, A. D., Doblas-Reyes, F. J., Dosio, A., Douville, H., Engelbrecht, F., Eyring, V., Fischer, E., Forster, P., Fox-Kemper, B., Fuglestvedt, J. S., Fyfe, J. C., Gillett, N. P., Goldfarb, L., Gorodetskaya, I., Gutierrez, J. M., Hamdi, R., Hawkins, E. ORCID: https://orcid.org/0000-0001-9477-3677, Hewitt, H. T., Hope, P., Islam, A. S., Jones, C., Kaufman, D. S., Kopp, R. E., Kosaka, Y., Kossin, J., Krakovska, S., Lee, J.-Y., Li, J., Mauritsen, T., Maycock, T. K., Meinshausen, M., Min, S.-K., Monteiro, P. M. S., Ngo-Duc, T., Otto, F., Pinto, I., Pirani, A., Raghavan, K., Ranasinghe, R., Ruane, A. C., Ruiz, L., Sallée, J.-B., Samset, B. H., Sathyendranath, S., Seneviratne, S. I., Sörensson, A. A., Szopa, S., Takayabu, I., Tréguier, A.-M., van den Hurk, B., Vautard, R., von Schuckmann, K., Zaehle, S., Zhang, X. and Zickfeld., K. (2021) Technical summary. In: Masson-Delmotte, V. P., Zhai, A., Pirani, S. L. and Connors, C. (eds.) Climate Change 2021: The Physical Science Basis: Working Group. Contribution to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK, pp. 33-144. doi: https://doi.org/10.1017/9781009157896.002

Bannister, R. N. (2021) Balance conditions in variational data assimilation for a high-resolution forecast model. Quarterly Journal of the Royal Meteorological Society, 147 (738). ISSN 1477-870X doi: https://doi.org/10.1002/qj.4106

Bonavita, M., Arcucci, R., Carrassi, A. ORCID: https://orcid.org/0000-0003-0722-5600, Dueben, P., Geer, A. J., Le Saux, B., Longépé, N., Mathieu, P.-P. and Raynaud, L. (2021) Machine learning for earth system observation and prediction. Bulletin of the American Meteorological Society, 102 (4). E710-E716. ISSN 1520-0477 doi: https://doi.org/10.1175/BAMS-D-20-0307.1

Brajard, J. ORCID: https://orcid.org/0000-0003-0634-1482, Carrassi, A. ORCID: https://orcid.org/0000-0003-0722-5600, Bocquet, M. and Bertino, L. (2021) Combining data assimilation and machine learning to infer unresolved scale parametrization. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379 (2194). 20200086. ISSN 1364-503X doi: https://doi.org/10.1098/rsta.2020.0086

Chen, Y. ORCID: https://orcid.org/0000-0002-2319-6937, Carrassi, A. ORCID: https://orcid.org/0000-0003-0722-5600 and Lucarini, V. ORCID: https://orcid.org/0000-0001-9392-1471 (2021) Inferring the instability of a dynamical system from the skill of data assimilation exercises. Nonlinear Processes in Geophysics, 28 (4). pp. 633-649. ISSN 1023-5809 doi: https://doi.org/10.5194/npg-28-633-2021

Chen, Y. ORCID: https://orcid.org/0000-0002-2319-6937, Simon, K. and Behrens, J. (2021) Extending legacy climate models by adaptive mesh refinement for single-component tracer transport: a case study with ECHAM6-HAMMOZ (ECHAM6.3-HAM2.3-MOZ1.0). Geoscientific Model Development, 14 (5). pp. 2289-2316. ISSN 1991-9603 doi: https://doi.org/10.5194/gmd-14-2289-2021

Dauzickaite, I., Lawless, A. S., Scott, J. A. ORCID: https://orcid.org/0000-0003-2130-1091 and Leeuwen, P. J. (2021) On time-parallel preconditioning for the state formulation of incremental weak constraint 4D-Var. Quarterly Journal of the Royal Meteorological Society, 147 (740). pp. 3521-3529. ISSN 1477-870X doi: https://doi.org/10.1002/qj.4140

Dong, B., Haines, K. ORCID: https://orcid.org/0000-0003-2768-2374 and Martin, M. (2021) Improved high resolution ocean reanalyses using a simple smoother algorithm. Journal of Advances in Modeling Earth Systems, 13 (12). e2021MS002626. ISSN 1942-2466 doi: https://doi.org/10.1029/2021MS002626

Douville, H., Raghavan, K., Renwick, J., Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, Arias, P. A., Barlow, M., Cerezo-Mota, R., Cherchi, A., Gan, T. Y., Gergis, J., Jiang, D., Khan, A., Mba, W. P., Rosenfeld, D., Tierney, J. and Zolina, O. (2021) Water cycle changes. In: Masson-Delmotte, V. P., Zhai, P., Pirani, A., Connors, S. L., Péan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., Lonno, E., Matthews, J. B. R., Maycock, T. K., Waterfield, T., Yelekçi, O., Yu, R. and Zhou, B. (eds.) Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to 45 the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK, pp. 1055-1210. doi: https://doi.org/10.1017/9781009157896.010

Evensen, G., Amezcua, J., Bocquet, M., Carrassi, A. ORCID: https://orcid.org/0000-0003-0722-5600, Farchi, A., Fowler, A. ORCID: https://orcid.org/0000-0003-3650-3948, Houtekamer, P. L., Jones, C. K., de Moraes, R. J., Pulido, M., Sampson, C. and Vossepoel, F. C. (2021) An international initiative of predicting the Sars-Cov-2 pandemic using ensemble data assimilation. Foundations of Data Science, 3 (3). pp. 413-477. ISSN 2639-8001 doi: https://doi.org/10.3934/fods.2021001

Fowler, H. J. ORCID: https://orcid.org/0000-0001-8848-3606, Ali, H., Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, Ban, N., Barbero, R. ORCID: https://orcid.org/0000-0001-8610-0018, Berg, P., Blenkinsop, S., Cabi, N. S., Chan, S., Dale, M. ORCID: https://orcid.org/0000-0002-1062-5771, Dunn, R. J. H. ORCID: https://orcid.org/0000-0003-2469-5989, Ekström, M., Evans, J. P. ORCID: https://orcid.org/0000-0003-1776-3429, Fosser, G., Golding, B., Guerreiro, S. B., Hegerl, G. C., Kahraman, A. ORCID: https://orcid.org/0000-0002-8180-1103, Kendon, E. J. ORCID: https://orcid.org/0000-0003-1538-2147, Lenderink, G. ORCID: https://orcid.org/0000-0002-1572-4867, Lewis, E., Li, X., O'Gorman, P. A. ORCID: https://orcid.org/0000-0003-1748-0816, Orr, H. G. ORCID: https://orcid.org/0000-0001-5021-1074, Peat, K. L., Prein, A. F. ORCID: https://orcid.org/0000-0001-6250-179X, Pritchard, D., Schär, C., Sharma, A. ORCID: https://orcid.org/0000-0002-6758-0519, Stott, P. A., Villalobos-Herrera, R., Villarini, G. ORCID: https://orcid.org/0000-0001-9566-2370, Wasko, C. ORCID: https://orcid.org/0000-0002-9166-8289, Wehner, M. F. ORCID: https://orcid.org/0000-0001-5991-0082, Westra, S. and Whitford, A. (2021) Towards advancing scientific knowledge of climate change impacts on short-duration rainfall extremes. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379 (2195). ISSN 1364-503X doi: https://doi.org/10.1098/rsta.2019.0542

Fowler, H. J., Lenderink, G., Prein, A. F., Westra, S., Allan, R. ORCID: https://orcid.org/0000-0003-0264-9447, Ban, N., Barbero, R., Berg, P., Blenkinsop, S., Do, H. X., Guerreiro, S. B., Haerter, J. O., Kendon, E., Lewis, E., Schaer, C., Sharma, A., Villarini, G., Wasko, C. and Zhang, X. (2021) Anthropogenic intensification of short-duration rainfall extremes. Nature Reviews Earth & Environment, 2. pp. 107-122. ISSN 2662-138X doi: https://doi.org/10.1038/s43017-020-00128-6

Gulev, S. K., Thorne, P. W., Ahn, J., Dentener, F. J., Domingues, C. M., Gerland, S., Gong, D., Kaufman, D. S., Nnamchi, H. C., Quaas, J., Rivera, J. A., Sathyendranath, S., Smith, S. L., Trewin, B., von Schuckmann, K., Vose, R. S., Allan, R. ORCID: https://orcid.org/0000-0003-0264-9447, Collins, B. ORCID: https://orcid.org/0000-0002-7419-0850, Turner, A. ORCID: https://orcid.org/0000-0002-0642-6876 and Hawkins, E. ORCID: https://orcid.org/0000-0001-9477-3677 (2021) Changing state of the climate system. In: Masson-Delmotte, V., Zhai, P., Pirani, A., Connors, S. L., Péan, C., Berger, S., Caud, N., Chen, Y., Goldfarb, L., Gomis, M. I., Huang, M., Leitzell, K., Lonnoy, E., Matthews, J. B. R., Maycock, T. K., Waterfield, T., Yelekçi, O., Yu, R. and Zhou, B. (eds.) Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK, pp. 287-422. doi: https://doi.org/10.1017/9781009157896.004

John, V. O., Shi, L., Chung, E.-S., Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, Buehler, S. A. and Soden, B. J. (2021) Upper tropospheric humidity [in "State of the Climate in 2020"]. In: State of the climate in 2020. American Meteorological Society, S55-S56. doi: https://doi.org/10.1175/BAMS-D-21-0098.1

Lees, K. J., Khomik, M., Quaife, T. ORCID: https://orcid.org/0000-0001-6896-4613, Clark, J. M. ORCID: https://orcid.org/0000-0002-0412-8824, Hill, T., Klein, D., Ritson, J. and Artz, R. R. E. (2021) Assessing the reliability of peatland GPP measurements by remote sensing: from plot to landscape scale. Science of the Total Environment, 766. 142613. ISSN 0048-9697 doi: https://doi.org/10.1016/j.scitotenv.2020.142613

Otkin, J. A., Potthast, R. W. E. ORCID: https://orcid.org/0000-0001-6794-2500 and Lawless, A. S. (2021) Nonlinear conditional model bias estimation for data assimilation. SIAM Journal on Applied Dynamical Systems, 20 (1). pp. 299-332. ISSN 1536-0040 doi: https://doi.org/10.1137/19M1294848

Pinnington, E., Amezcua, J., Cooper, E., Dadson, S., Ellis, R., Peng, J., Robinson, E., Morrison, R., Osborne, S. and Quaife, T. ORCID: https://orcid.org/0000-0001-6896-4613 (2021) Improving soil moisture prediction of a high-resolution land surface model by parameterising pedotransfer functions through assimilation of SMAP satellite data. Hydrology and Earth System Sciences, 25 (3). pp. 1617-1641. ISSN 1027-5606 doi: https://doi.org/10.5194/hess-25-1617-2021

Ren, H., Amezcua, J. and Van Leeuwen, P. J. (2021) Effects of misspecified time-correlated model error in the (ensemble) Kalman Smoother. Quarterly Journal of the Royal Meteorological Society, 147 (734). pp. 573-588. ISSN 1477-870X doi: https://doi.org/10.1002/qj.3934

Rollinson, C. R. ORCID: https://orcid.org/0000-0003-0181-7293, Dawson, A., Raiho, A. M., Williams, J. W., Dietze, M. C. ORCID: https://orcid.org/0000-0002-2324-2518, Hickler, T., Jackson, S. T., McLachlan, J., Moore, D. J. P., Poulter, B., Quaife, T. ORCID: https://orcid.org/0000-0001-6896-4613, Steinkamp, J. ORCID: https://orcid.org/0000-0002-7861-8789, Trachsel, M. and Morin, X. (2021) Forest responses to last‐millennium hydroclimate variability are governed by spatial variations in ecosystem sensitivity. Ecology Letters, 24 (3). pp. 498-508. ISSN 1461-023X doi: https://doi.org/10.1111/ele.13667

Sampson, C. ORCID: https://orcid.org/0000-0002-4275-4877, Carrassi, A. ORCID: https://orcid.org/0000-0003-0722-5600, Aydogdu, A. ORCID: https://orcid.org/0000-0002-1557-7502 and Jones, C. K.R.T. (2021) Ensemble Kalman Filter for non‐conservative moving mesh solvers with a joint physics and mesh location update. Quarterly Journal of the Royal Meteorological Society, 147 (736). pp. 1539-1567. ISSN 0035-9009 doi: https://doi.org/10.1002/qj.3980

Seneviratne, S. I., Zhang, X., Adnan, M., Badi, W., Dereczynski, C., Luca, A. D., Ghosh, S., Iskandar, I., Kossin, J., Lewis, S., Otto, F., Pinto, I., Satoh, M., Vicente-Serrano, S. M., Wehner, M., Zhou, B. and Allan, R. ORCID: https://orcid.org/0000-0003-0264-9447 (2021) Weather and climate extreme events in a changing climate. In: Masson-Delmotte, V. P., Zhai, A., Pirani, S. L. and Connors, C. (eds.) Climate Change 2021: The Physical Science Basis: Working Group I contribution to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge, UK, pp. 1513-1766. doi: https://doi.org/10.1017/9781009157896.013

Wainwright, C. M. ORCID: https://orcid.org/0000-0002-7311-7846, Black, E. ORCID: https://orcid.org/0000-0003-1344-6186 and Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447 (2021) Future changes in wet and dry season characteristics in CMIP5 and CMIP6 simulations. Journal of Hydrometeorology, 22 (9). pp. 2339-2357. ISSN 1525-7541 doi: https://doi.org/10.1175/JHM-D-21-0017.1

Watters, D., Battaglia, A. and Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447 (2021) The diurnal cycle of precipitation according to multiple decades of global satellite observations, three CMIP6 models, and the ECMWF reanalysis. Journal of Climate, 34 (12). pp. 5063-5080. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI-D-20-0966.1

Wells, C. A. ORCID: https://orcid.org/0000-0001-9438-4954, Williams, P. D. ORCID: https://orcid.org/0000-0002-9713-9820, Nichols, N. K. ORCID: https://orcid.org/0000-0003-1133-5220, Kalise, D. ORCID: https://orcid.org/0000-0003-2327-1957 and Poll, I. ORCID: https://orcid.org/0000-0001-8057-8467 (2021) Reducing transatlantic flight emissions by fuel-optimised routing. Environmental Research Letters, 16 (2). 025002. ISSN 1748-9326 doi: https://doi.org/10.1088/1748-9326/abce82

Yang, C., Leonelli, F. E., Marullo, S., Artale, V., Beggs, H., Bunogiorno Nardelli, B., Chin, T. M., De Toma, V., Good, S., Huang, B., Merchant, C. J. ORCID: https://orcid.org/0000-0003-4687-9850, Sakurai, T., Santoleri, R., Vazquez-Cuervo, J., Zhang, H.-M. and Pisano, A. (2021) Sea surface temperature intercomparison in the framework of the Copernicus Climate Change Service (C3S). Journal of Climate, 34 (13). pp. 5257-5283. ISSN 1520-0442 doi: https://doi.org/10.1175/JCLI-D-20-0793.1

Yeh, S.-W. ORCID: https://orcid.org/0000-0003-4549-1686, Song, S.-Y. ORCID: https://orcid.org/0000-0002-9447-1158, Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, An, S.-I. ORCID: https://orcid.org/0000-0002-0003-429X and Shin, J. ORCID: https://orcid.org/0000-0002-3199-7646 (2021) Contrasting response of hydrological cycle over land and ocean to a changing CO2 pathway. npj Climate and Atmospheric Science, 4 (1). 53. ISSN 2397-3722 doi: https://doi.org/10.1038/s41612-021-00206-6

van der Schrier, G. ORCID: https://orcid.org/0000-0001-7395-8023, Allan, R. P. ORCID: https://orcid.org/0000-0003-0264-9447, Osso, A., Sousa, P. M. ORCID: https://orcid.org/0000-0002-0296-4204, Van de Vyver, H. ORCID: https://orcid.org/0000-0001-7142-4693, Van Schaeybroeck, B. ORCID: https://orcid.org/0000-0002-9507-7929, Coscarelli, R. ORCID: https://orcid.org/0000-0002-2779-1100, Pasqua, A. A., Petrucci, O. ORCID: https://orcid.org/0000-0001-6918-1135, Curley, M., Mietus, M. ORCID: https://orcid.org/0000-0002-9488-071X, Filipiak, J., Štěpánek, P. ORCID: https://orcid.org/0000-0001-8956-5590, Zahradníček, P., Brázdil, R., Řezníčková, L., van den Besselaar, E. J. M., Trigo, R. and Aguilar, E. ORCID: https://orcid.org/0000-0002-8384-377X (2021) The 1921 European drought: impacts, reconstruction and drivers. Climate of the Past, 17 (5). pp. 2201-2221. ISSN 1814-9332 doi: https://doi.org/10.5194/cp-17-2201-2021